feat(mobile): stack original + edited photo on ios

Detect an iOS edit, upload the unedited original, and stack the edited
version on top of it. Reverting in Photos flips the stack cover back to
the original and keeps the edits. Adds an optional stackParentId field to
the asset upload on the server.

.github/workflows/build-mobile.yml

@@ -230,10 +230,6 @@ jobs:
       - name: Generate platform APIs
         run: mise //mobile:codegen:pigeon
 
-      - name: Resolve iOS Swift Packages
-        working-directory: ./mobile
-        run: flutter build ios --config-only --no-codesign
-
       - name: Setup Ruby
         uses: ruby/setup-ruby@6aaa311d81eba98ae12eaffbcb63296ace0efcde # v1.307.0
         with:

mise.lock

@@ -1,31 +1,9 @@
 # @generated - this file is auto-generated by `mise lock` https://mise.en.dev/dev-tools/mise-lock.html
 
 [[tools."aqua:flutter/flutter"]]
-version = "3.44.0"
+version = "3.41.9"
 backend = "aqua:flutter/flutter"
 
-[tools."aqua:flutter/flutter"."platforms.linux-arm64"]
-url = "https://storage.googleapis.com/flutter_infra_release/releases/stable/linux/flutter_linux_3.44.0-stable.tar.xz"
-
-[tools."aqua:flutter/flutter"."platforms.linux-arm64-musl"]
-url = "https://storage.googleapis.com/flutter_infra_release/releases/stable/linux/flutter_linux_3.44.0-stable.tar.xz"
-
-[tools."aqua:flutter/flutter"."platforms.linux-x64"]
-url = "https://storage.googleapis.com/flutter_infra_release/releases/stable/linux/flutter_linux_3.44.0-stable.tar.xz"
-
-[tools."aqua:flutter/flutter"."platforms.linux-x64-musl"]
-url = "https://storage.googleapis.com/flutter_infra_release/releases/stable/linux/flutter_linux_3.44.0-stable.tar.xz"
-
-[tools."aqua:flutter/flutter"."platforms.macos-arm64"]
-checksum = "blake3:fb03aa5d9790205c948922ec3f0751c16e4575b09d6ae9dd4fbeb664a69f0e00"
-url = "https://storage.googleapis.com/flutter_infra_release/releases/stable/macos/flutter_macos_arm64_3.44.0-stable.zip"
-
-[tools."aqua:flutter/flutter"."platforms.macos-x64"]
-url = "https://storage.googleapis.com/flutter_infra_release/releases/stable/macos/flutter_macos_3.44.0-stable.zip"
-
-[tools."aqua:flutter/flutter"."platforms.windows-x64"]
-url = "https://storage.googleapis.com/flutter_infra_release/releases/stable/windows/flutter_windows_3.44.0-stable.zip"
-
 [[tools.flutter]]
 version = "3.41.9-stable"
 backend = "asdf:flutter"

mise.toml

@@ -16,7 +16,7 @@ config_roots = [
 
 [tools]
 node = "24.15.0"
-"aqua:flutter/flutter" = "3.44.0"
+"aqua:flutter/flutter" = "3.41.9"
 pnpm = "10.33.4"
 terragrunt = "1.0.3"
 opentofu = "1.11.6"

mobile/.vscode/settings.json

@@ -1,4 +1,5 @@
 {
+  "dart.flutterSdkPath": ".fvm/versions/3.41.9",
   "dart.lineLength": 120,
   "[dart]": {
     "editor.rulers": [

mobile/android/app/src/main/kotlin/app/alextran/immich/sync/Messages.g.kt

@@ -207,6 +207,18 @@ enum class PlatformAssetPlaybackStyle(val raw: Int) {
   }
 }
 
+enum class EditState(val raw: Int) {
+  NOT_EDITED(0),
+  EDITED(1),
+  UNKNOWN(2);
+
+  companion object {
+    fun ofRaw(raw: Int): EditState? {
+      return values().firstOrNull { it.raw == raw }
+    }
+  }
+}
+
 /** Generated class from Pigeon that represents data sent in messages. */
 data class PlatformAsset (
   val id: String,
@@ -472,6 +484,52 @@ data class CloudIdResult (
     return result
   }
 }
+
+/** Generated class from Pigeon that represents data sent in messages. */
+data class BaseResource (
+  val path: String,
+  val sha1: String,
+  val sizeBytes: Long,
+  val mimeType: String
+)
+ {
+  companion object {
+    fun fromList(pigeonVar_list: List<Any?>): BaseResource {
+      val path = pigeonVar_list[0] as String
+      val sha1 = pigeonVar_list[1] as String
+      val sizeBytes = pigeonVar_list[2] as Long
+      val mimeType = pigeonVar_list[3] as String
+      return BaseResource(path, sha1, sizeBytes, mimeType)
+    }
+  }
+  fun toList(): List<Any?> {
+    return listOf(
+      path,
+      sha1,
+      sizeBytes,
+      mimeType,
+    )
+  }
+  override fun equals(other: Any?): Boolean {
+    if (other == null || other.javaClass != javaClass) {
+      return false
+    }
+    if (this === other) {
+      return true
+    }
+    val other = other as BaseResource
+    return MessagesPigeonUtils.deepEquals(this.path, other.path) && MessagesPigeonUtils.deepEquals(this.sha1, other.sha1) && MessagesPigeonUtils.deepEquals(this.sizeBytes, other.sizeBytes) && MessagesPigeonUtils.deepEquals(this.mimeType, other.mimeType)
+  }
+
+  override fun hashCode(): Int {
+    var result = javaClass.hashCode()
+    result = 31 * result + MessagesPigeonUtils.deepHash(this.path)
+    result = 31 * result + MessagesPigeonUtils.deepHash(this.sha1)
+    result = 31 * result + MessagesPigeonUtils.deepHash(this.sizeBytes)
+    result = 31 * result + MessagesPigeonUtils.deepHash(this.mimeType)
+    return result
+  }
+}
 private open class MessagesPigeonCodec : StandardMessageCodec() {
   override fun readValueOfType(type: Byte, buffer: ByteBuffer): Any? {
     return when (type) {
@@ -481,30 +539,40 @@ private open class MessagesPigeonCodec : StandardMessageCodec() {
         }
       }
       130.toByte() -> {
-        return (readValue(buffer) as? List<Any?>)?.let {
-          PlatformAsset.fromList(it)
+        return (readValue(buffer) as Long?)?.let {
+          EditState.ofRaw(it.toInt())
         }
       }
       131.toByte() -> {
         return (readValue(buffer) as? List<Any?>)?.let {
-          PlatformAlbum.fromList(it)
+          PlatformAsset.fromList(it)
         }
       }
       132.toByte() -> {
         return (readValue(buffer) as? List<Any?>)?.let {
-          SyncDelta.fromList(it)
+          PlatformAlbum.fromList(it)
         }
       }
       133.toByte() -> {
         return (readValue(buffer) as? List<Any?>)?.let {
-          HashResult.fromList(it)
+          SyncDelta.fromList(it)
         }
       }
       134.toByte() -> {
+        return (readValue(buffer) as? List<Any?>)?.let {
+          HashResult.fromList(it)
+        }
+      }
+      135.toByte() -> {
         return (readValue(buffer) as? List<Any?>)?.let {
           CloudIdResult.fromList(it)
         }
       }
+      136.toByte() -> {
+        return (readValue(buffer) as? List<Any?>)?.let {
+          BaseResource.fromList(it)
+        }
+      }
       else -> super.readValueOfType(type, buffer)
     }
   }
@@ -514,26 +582,34 @@ private open class MessagesPigeonCodec : StandardMessageCodec() {
         stream.write(129)
         writeValue(stream, value.raw.toLong())
       }
-      is PlatformAsset -> {
+      is EditState -> {
         stream.write(130)
-        writeValue(stream, value.toList())
+        writeValue(stream, value.raw.toLong())
       }
-      is PlatformAlbum -> {
+      is PlatformAsset -> {
         stream.write(131)
         writeValue(stream, value.toList())
       }
-      is SyncDelta -> {
+      is PlatformAlbum -> {
         stream.write(132)
         writeValue(stream, value.toList())
       }
-      is HashResult -> {
+      is SyncDelta -> {
         stream.write(133)
         writeValue(stream, value.toList())
       }
-      is CloudIdResult -> {
+      is HashResult -> {
         stream.write(134)
         writeValue(stream, value.toList())
       }
+      is CloudIdResult -> {
+        stream.write(135)
+        writeValue(stream, value.toList())
+      }
+      is BaseResource -> {
+        stream.write(136)
+        writeValue(stream, value.toList())
+      }
       else -> super.writeValue(stream, value)
     }
   }
@@ -555,6 +631,8 @@ interface NativeSyncApi {
   fun getTrashedAssets(): Map<String, List<PlatformAsset>>
   fun restoreFromTrashById(mediaId: String, type: Long, callback: (Result<Boolean>) -> Unit)
   fun getCloudIdForAssetIds(assetIds: List<String>): List<CloudIdResult>
+  fun getBaseResource(assetId: String, allowNetworkAccess: Boolean, callback: (Result<BaseResource?>) -> Unit)
+  fun getEditState(assetId: String, allowNetworkAccess: Boolean, callback: (Result<EditState>) -> Unit)
 
   companion object {
     /** The codec used by NativeSyncApi. */
@@ -786,6 +864,48 @@ interface NativeSyncApi {
           channel.setMessageHandler(null)
         }
       }
+      run {
+        val channel = BasicMessageChannel<Any?>(binaryMessenger, "dev.flutter.pigeon.immich_mobile.NativeSyncApi.getBaseResource$separatedMessageChannelSuffix", codec, taskQueue)
+        if (api != null) {
+          channel.setMessageHandler { message, reply ->
+            val args = message as List<Any?>
+            val assetIdArg = args[0] as String
+            val allowNetworkAccessArg = args[1] as Boolean
+            api.getBaseResource(assetIdArg, allowNetworkAccessArg) { result: Result<BaseResource?> ->
+              val error = result.exceptionOrNull()
+              if (error != null) {
+                reply.reply(MessagesPigeonUtils.wrapError(error))
+              } else {
+                val data = result.getOrNull()
+                reply.reply(MessagesPigeonUtils.wrapResult(data))
+              }
+            }
+          }
+        } else {
+          channel.setMessageHandler(null)
+        }
+      }
+      run {
+        val channel = BasicMessageChannel<Any?>(binaryMessenger, "dev.flutter.pigeon.immich_mobile.NativeSyncApi.getEditState$separatedMessageChannelSuffix", codec, taskQueue)
+        if (api != null) {
+          channel.setMessageHandler { message, reply ->
+            val args = message as List<Any?>
+            val assetIdArg = args[0] as String
+            val allowNetworkAccessArg = args[1] as Boolean
+            api.getEditState(assetIdArg, allowNetworkAccessArg) { result: Result<EditState> ->
+              val error = result.exceptionOrNull()
+              if (error != null) {
+                reply.reply(MessagesPigeonUtils.wrapError(error))
+              } else {
+                val data = result.getOrNull()
+                reply.reply(MessagesPigeonUtils.wrapResult(data))
+              }
+            }
+          }
+        } else {
+          channel.setMessageHandler(null)
+        }
+      }
     }
   }
 }

mobile/android/app/src/main/kotlin/app/alextran/immich/sync/MessagesImplBase.kt

@@ -476,4 +476,14 @@ open class NativeSyncApiImplBase(context: Context) : ImmichPlugin(), ActivityAwa
   fun getCloudIdForAssetIds(assetIds: List<String>): List<CloudIdResult> {
     return emptyList()
   }
+
+  // Android has no Photos-style edit original to stack; iOS-only.
+  fun getBaseResource(assetId: String, allowNetworkAccess: Boolean, callback: (Result<BaseResource?>) -> Unit) {
+    callback(Result.success(null))
+  }
+
+  // iOS-only; Android assets never carry a Photos-style edit.
+  fun getEditState(assetId: String, allowNetworkAccess: Boolean, callback: (Result<EditState>) -> Unit) {
+    callback(Result.success(EditState.NOT_EDITED))
+  }
 }

mobile/android/gradle.properties

@@ -5,7 +5,3 @@ android.nonTransitiveRClass=false
 android.nonFinalResIds=false
 org.gradle.caching=true
 org.gradle.parallel=true
-# This builtInKotlin flag was added automatically by Flutter migrator
-android.builtInKotlin=false
-# This newDsl flag was added automatically by Flutter migrator
-android.newDsl=false

mobile/ios/Podfile.lock

@@ -1,23 +1,58 @@
 PODS:
+  - background_downloader (0.0.1):
+    - Flutter
   - bonsoir_darwin (0.0.1):
     - Flutter
     - FlutterMacOS
+  - connectivity_plus (0.0.1):
+    - Flutter
   - cupertino_http (0.0.1):
     - Flutter
     - FlutterMacOS
+  - device_info_plus (0.0.1):
+    - Flutter
   - Flutter (1.0.0)
   - flutter_local_notifications (0.0.1):
     - Flutter
+  - flutter_native_splash (2.4.3):
+    - Flutter
   - flutter_secure_storage (6.0.0):
     - Flutter
+  - flutter_udid (0.0.1):
+    - Flutter
+    - KeychainAccess
+  - flutter_web_auth_2 (5.0.0):
+    - Flutter
   - fluttertoast (0.0.2):
     - Flutter
+  - geolocator_apple (1.2.0):
+    - Flutter
+    - FlutterMacOS
   - home_widget (0.0.1):
     - Flutter
+  - image_picker_ios (0.0.1):
+    - Flutter
+  - integration_test (0.0.1):
+    - Flutter
+  - KeychainAccess (4.2.2)
+  - local_auth_darwin (0.0.1):
+    - Flutter
+    - FlutterMacOS
+  - MapLibre (6.14.0)
+  - maplibre_gl (0.0.1):
+    - Flutter
+    - MapLibre (= 6.14.0)
   - native_video_player (1.0.0):
     - Flutter
+  - network_info_plus (0.0.1):
+    - Flutter
+  - package_info_plus (0.4.5):
+    - Flutter
   - permission_handler_apple (9.3.0):
     - Flutter
+  - photo_manager (3.9.0):
+    - Flutter
+    - FlutterMacOS
   - share_handler_ios (0.0.14):
     - Flutter
     - share_handler_ios/share_handler_ios_models (= 0.0.14)
@@ -26,56 +61,144 @@ PODS:
     - Flutter
     - share_handler_ios_models
   - share_handler_ios_models (0.0.9)
+  - share_plus (0.0.1):
+    - Flutter
+  - shared_preferences_foundation (0.0.1):
+    - Flutter
+    - FlutterMacOS
+  - url_launcher_ios (0.0.1):
+    - Flutter
+  - wakelock_plus (0.0.1):
+    - Flutter
 
 DEPENDENCIES:
+  - background_downloader (from `.symlinks/plugins/background_downloader/ios`)
   - bonsoir_darwin (from `.symlinks/plugins/bonsoir_darwin/darwin`)
+  - connectivity_plus (from `.symlinks/plugins/connectivity_plus/ios`)
   - cupertino_http (from `.symlinks/plugins/cupertino_http/darwin`)
+  - device_info_plus (from `.symlinks/plugins/device_info_plus/ios`)
   - Flutter (from `Flutter`)
   - flutter_local_notifications (from `.symlinks/plugins/flutter_local_notifications/ios`)
+  - flutter_native_splash (from `.symlinks/plugins/flutter_native_splash/ios`)
   - flutter_secure_storage (from `.symlinks/plugins/flutter_secure_storage/ios`)
+  - flutter_udid (from `.symlinks/plugins/flutter_udid/ios`)
+  - flutter_web_auth_2 (from `.symlinks/plugins/flutter_web_auth_2/ios`)
   - fluttertoast (from `.symlinks/plugins/fluttertoast/ios`)
+  - geolocator_apple (from `.symlinks/plugins/geolocator_apple/darwin`)
   - home_widget (from `.symlinks/plugins/home_widget/ios`)
+  - image_picker_ios (from `.symlinks/plugins/image_picker_ios/ios`)
+  - integration_test (from `.symlinks/plugins/integration_test/ios`)
+  - local_auth_darwin (from `.symlinks/plugins/local_auth_darwin/darwin`)
+  - maplibre_gl (from `.symlinks/plugins/maplibre_gl/ios`)
   - native_video_player (from `.symlinks/plugins/native_video_player/ios`)
+  - network_info_plus (from `.symlinks/plugins/network_info_plus/ios`)
+  - package_info_plus (from `.symlinks/plugins/package_info_plus/ios`)
   - permission_handler_apple (from `.symlinks/plugins/permission_handler_apple/ios`)
+  - photo_manager (from `.symlinks/plugins/photo_manager/darwin`)
   - share_handler_ios (from `.symlinks/plugins/share_handler_ios/ios`)
   - share_handler_ios_models (from `.symlinks/plugins/share_handler_ios/ios/Models`)
+  - share_plus (from `.symlinks/plugins/share_plus/ios`)
+  - shared_preferences_foundation (from `.symlinks/plugins/shared_preferences_foundation/darwin`)
+  - url_launcher_ios (from `.symlinks/plugins/url_launcher_ios/ios`)
+  - wakelock_plus (from `.symlinks/plugins/wakelock_plus/ios`)
+
+SPEC REPOS:
+  trunk:
+    - KeychainAccess
+    - MapLibre
 
 EXTERNAL SOURCES:
+  background_downloader:
+    :path: ".symlinks/plugins/background_downloader/ios"
   bonsoir_darwin:
     :path: ".symlinks/plugins/bonsoir_darwin/darwin"
+  connectivity_plus:
+    :path: ".symlinks/plugins/connectivity_plus/ios"
   cupertino_http:
     :path: ".symlinks/plugins/cupertino_http/darwin"
+  device_info_plus:
+    :path: ".symlinks/plugins/device_info_plus/ios"
   Flutter:
     :path: Flutter
   flutter_local_notifications:
     :path: ".symlinks/plugins/flutter_local_notifications/ios"
+  flutter_native_splash:
+    :path: ".symlinks/plugins/flutter_native_splash/ios"
   flutter_secure_storage:
     :path: ".symlinks/plugins/flutter_secure_storage/ios"
+  flutter_udid:
+    :path: ".symlinks/plugins/flutter_udid/ios"
+  flutter_web_auth_2:
+    :path: ".symlinks/plugins/flutter_web_auth_2/ios"
   fluttertoast:
     :path: ".symlinks/plugins/fluttertoast/ios"
+  geolocator_apple:
+    :path: ".symlinks/plugins/geolocator_apple/darwin"
   home_widget:
     :path: ".symlinks/plugins/home_widget/ios"
+  image_picker_ios:
+    :path: ".symlinks/plugins/image_picker_ios/ios"
+  integration_test:
+    :path: ".symlinks/plugins/integration_test/ios"
+  local_auth_darwin:
+    :path: ".symlinks/plugins/local_auth_darwin/darwin"
+  maplibre_gl:
+    :path: ".symlinks/plugins/maplibre_gl/ios"
   native_video_player:
     :path: ".symlinks/plugins/native_video_player/ios"
+  network_info_plus:
+    :path: ".symlinks/plugins/network_info_plus/ios"
+  package_info_plus:
+    :path: ".symlinks/plugins/package_info_plus/ios"
   permission_handler_apple:
     :path: ".symlinks/plugins/permission_handler_apple/ios"
+  photo_manager:
+    :path: ".symlinks/plugins/photo_manager/darwin"
   share_handler_ios:
     :path: ".symlinks/plugins/share_handler_ios/ios"
   share_handler_ios_models:
     :path: ".symlinks/plugins/share_handler_ios/ios/Models"
+  share_plus:
+    :path: ".symlinks/plugins/share_plus/ios"
+  shared_preferences_foundation:
+    :path: ".symlinks/plugins/shared_preferences_foundation/darwin"
+  url_launcher_ios:
+    :path: ".symlinks/plugins/url_launcher_ios/ios"
+  wakelock_plus:
+    :path: ".symlinks/plugins/wakelock_plus/ios"
 
 SPEC CHECKSUMS:
+  background_downloader: 50e91d979067b82081aba359d7d916b3ba5fadad
   bonsoir_darwin: 29c7ccf356646118844721f36e1de4b61f6cbd0e
+  connectivity_plus: cb623214f4e1f6ef8fe7403d580fdad517d2f7dd
   cupertino_http: 94ac07f5ff090b8effa6c5e2c47871d48ab7c86c
+  device_info_plus: 21fcca2080fbcd348be798aa36c3e5ed849eefbe
   Flutter: cabc95a1d2626b1b06e7179b784ebcf0c0cde467
   flutter_local_notifications: ad39620c743ea4c15127860f4b5641649a988100
+  flutter_native_splash: c32d145d68aeda5502d5f543ee38c192065986cf
   flutter_secure_storage: 1ed9476fba7e7a782b22888f956cce43e2c62f13
+  flutter_udid: 92a5d31fe0526b7b6002a2318df702e12e7eb300
+  flutter_web_auth_2: 646fc9df97a01c59e5eea99b237da2c6360f8439
   fluttertoast: 2c67e14dce98bbdb200df9e1acf610d7a6264ea1
+  geolocator_apple: ab36aa0e8b7d7a2d7639b3b4e48308394e8cef5e
   home_widget: f169fc41fd807b4d46ab6615dc44d62adbf9f64f
+  image_picker_ios: e0ece4aa2a75771a7de3fa735d26d90817041326
+  integration_test: 4a889634ef21a45d28d50d622cf412dc6d9f586e
+  KeychainAccess: c0c4f7f38f6fc7bbe58f5702e25f7bd2f65abf51
+  local_auth_darwin: c3ee6cce0a8d56be34c8ccb66ba31f7f180aaebb
+  MapLibre: 69e572367f4ef6287e18246cfafc39c80cdcabcd
+  maplibre_gl: 3c924e44725147b03dda33430ad216005b40555f
   native_video_player: b65c58951ede2f93d103a25366bdebca95081265
+  network_info_plus: cf61925ab5205dce05a4f0895989afdb6aade5fc
+  package_info_plus: af8e2ca6888548050f16fa2f1938db7b5a5df499
   permission_handler_apple: 4ed2196e43d0651e8ff7ca3483a069d469701f2d
+  photo_manager: 25fd77df14f4f0ba5ef99e2c61814dde77e2bceb
   share_handler_ios: e2244e990f826b2c8eaa291ac3831569438ba0fb
   share_handler_ios_models: fc638c9b4330dc7f082586c92aee9dfa0b87b871
+  share_plus: 50da8cb520a8f0f65671c6c6a99b3617ed10a58a
+  shared_preferences_foundation: 7036424c3d8ec98dfe75ff1667cb0cd531ec82bb
+  url_launcher_ios: 7a95fa5b60cc718a708b8f2966718e93db0cef1b
+  wakelock_plus: e29112ab3ef0b318e58cfa5c32326458be66b556
 
 PODFILE CHECKSUM: 938abbae4114b9c2140c550a2a0d8f7c674f5dfe
 

mobile/ios/Runner.xcodeproj/project.pbxproj

@@ -39,7 +39,6 @@
 		FEE084F82EC172460045228E /* SQLiteData in Frameworks */ = {isa = PBXBuildFile; productRef = FEE084F72EC172460045228E /* SQLiteData */; };
 		FEE084FB2EC1725A0045228E /* RawStructuredFieldValues in Frameworks */ = {isa = PBXBuildFile; productRef = FEE084FA2EC1725A0045228E /* RawStructuredFieldValues */; };
 		FEE084FD2EC1725A0045228E /* StructuredFieldValues in Frameworks */ = {isa = PBXBuildFile; productRef = FEE084FC2EC1725A0045228E /* StructuredFieldValues */; };
-		78A318202AECB46A00862997 /* FlutterGeneratedPluginSwiftPackage in Frameworks */ = {isa = PBXBuildFile; productRef = 78A3181F2AECB46A00862997 /* FlutterGeneratedPluginSwiftPackage */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXContainerItemProxy section */
@@ -130,7 +129,6 @@
 		FE5499F72F1198DE006016CB /* RemoteImagesImpl.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = RemoteImagesImpl.swift; sourceTree = "<group>"; };
 		FE5FE4AD2F30FBC000A71243 /* ImageProcessing.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ImageProcessing.swift; sourceTree = "<group>"; };
 		FEAFA8722E4D42F4001E47FE /* Thumbhash.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Thumbhash.swift; sourceTree = "<group>"; };
-		78E0A7A72DC9AD7400C4905E /* FlutterGeneratedPluginSwiftPackage */ = {isa = PBXFileReference; lastKnownFileType = wrapper; name = FlutterGeneratedPluginSwiftPackage; path = Flutter/ephemeral/Packages/FlutterGeneratedPluginSwiftPackage; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFileSystemSynchronizedBuildFileExceptionSet section */
@@ -195,7 +193,6 @@
 			isa = PBXFrameworksBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
-				78A318202AECB46A00862997 /* FlutterGeneratedPluginSwiftPackage in Frameworks */,
 				FEE084F82EC172460045228E /* SQLiteData in Frameworks */,
 				FEE084FB2EC1725A0045228E /* RawStructuredFieldValues in Frameworks */,
 				FEE084FD2EC1725A0045228E /* StructuredFieldValues in Frameworks */,
@@ -250,7 +247,6 @@
 		9740EEB11CF90186004384FC /* Flutter */ = {
 			isa = PBXGroup;
 			children = (
-				78E0A7A72DC9AD7400C4905E /* FlutterGeneratedPluginSwiftPackage */,
 				3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */,
 				9740EEB21CF90195004384FC /* Debug.xcconfig */,
 				7AFA3C8E1D35360C0083082E /* Release.xcconfig */,
@@ -364,9 +360,6 @@
 
 /* Begin PBXNativeTarget section */
 		97C146ED1CF9000F007C117D /* Runner */ = {
-			packageProductDependencies = (
-				78A3181F2AECB46A00862997 /* FlutterGeneratedPluginSwiftPackage */,
-			);
 			isa = PBXNativeTarget;
 			buildConfigurationList = 97C147051CF9000F007C117D /* Build configuration list for PBXNativeTarget "Runner" */;
 			buildPhases = (
@@ -470,7 +463,6 @@
 			);
 			mainGroup = 97C146E51CF9000F007C117D;
 			packageReferences = (
-				781AD8BC2B33823900A9FFBB /* XCLocalSwiftPackageReference "Flutter/ephemeral/Packages/FlutterGeneratedPluginSwiftPackage" */,
 				FEE084F62EC172460045228E /* XCRemoteSwiftPackageReference "sqlite-data" */,
 				FEE084F92EC1725A0045228E /* XCRemoteSwiftPackageReference "swift-http-structured-headers" */,
 			);
@@ -1293,17 +1285,7 @@
 			package = FEE084F92EC1725A0045228E /* XCRemoteSwiftPackageReference "swift-http-structured-headers" */;
 			productName = StructuredFieldValues;
 		};
-		78A3181F2AECB46A00862997 /* FlutterGeneratedPluginSwiftPackage */ = {
-			isa = XCSwiftPackageProductDependency;
-			productName = FlutterGeneratedPluginSwiftPackage;
-		};
 /* End XCSwiftPackageProductDependency section */
-/* Begin XCLocalSwiftPackageReference section */
-		781AD8BC2B33823900A9FFBB /* XCLocalSwiftPackageReference "Flutter/ephemeral/Packages/FlutterGeneratedPluginSwiftPackage" */ = {
-			isa = XCLocalSwiftPackageReference;
-			relativePath = Flutter/ephemeral/Packages/FlutterGeneratedPluginSwiftPackage;
-		};
-/* End XCLocalSwiftPackageReference section */
 	};
 	rootObject = 97C146E61CF9000F007C117D /* Project object */;
 }

mobile/ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -1,4 +1,5 @@
 {
+  "originHash" : "9be33bfaa68721646604aefff3cabbdaf9a193da192aae024c265065671f6c49",
   "pins" : [
     {
       "identity" : "combine-schedulers",
@@ -18,24 +19,6 @@
         "version" : "7.8.0"
       }
     },
-    {
-      "identity" : "keychainaccess",
-      "kind" : "remoteSourceControl",
-      "location" : "https://github.com/kishikawakatsumi/KeychainAccess",
-      "state" : {
-        "revision" : "84e546727d66f1adc5439debad16270d0fdd04e7",
-        "version" : "4.2.2"
-      }
-    },
-    {
-      "identity" : "maplibre-gl-native-distribution",
-      "kind" : "remoteSourceControl",
-      "location" : "https://github.com/maplibre/maplibre-gl-native-distribution.git",
-      "state" : {
-        "revision" : "60d9bb85c94ce6e7fc4406cd32529fd12bdb7809",
-        "version" : "6.14.0"
-      }
-    },
     {
       "identity" : "sqlite-data",
       "kind" : "remoteSourceControl",
@@ -163,5 +146,5 @@
       }
     }
   ],
-  "version" : 2
+  "version" : 3
 }

mobile/ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme

@@ -5,24 +5,6 @@
    <BuildAction
       parallelizeBuildables = "YES"
       buildImplicitDependencies = "YES">
-      <PreActions>
-         <ExecutionAction
-            ActionType = "Xcode.IDEStandardExecutionActionsCore.ExecutionActionType.ShellScriptAction">
-            <ActionContent
-               title = "Run Prepare Flutter Framework Script"
-               scriptText = "/bin/sh &quot;$FLUTTER_ROOT/packages/flutter_tools/bin/xcode_backend.sh&quot; prepare&#10;">
-               <EnvironmentBuildable>
-                  <BuildableReference
-                     BuildableIdentifier = "primary"
-                     BlueprintIdentifier = "97C146ED1CF9000F007C117D"
-                     BuildableName = "Immich.app"
-                     BlueprintName = "Runner"
-                     ReferencedContainer = "container:Runner.xcodeproj">
-                  </BuildableReference>
-               </EnvironmentBuildable>
-            </ActionContent>
-         </ExecutionAction>
-      </PreActions>
       <BuildActionEntries>
          <BuildActionEntry
             buildForTesting = "YES"

mobile/ios/Runner.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -1,4 +1,5 @@
 {
+  "originHash" : "9be33bfaa68721646604aefff3cabbdaf9a193da192aae024c265065671f6c49",
   "pins" : [
     {
       "identity" : "combine-schedulers",
@@ -18,24 +19,6 @@
         "version" : "7.9.0"
       }
     },
-    {
-      "identity" : "keychainaccess",
-      "kind" : "remoteSourceControl",
-      "location" : "https://github.com/kishikawakatsumi/KeychainAccess",
-      "state" : {
-        "revision" : "84e546727d66f1adc5439debad16270d0fdd04e7",
-        "version" : "4.2.2"
-      }
-    },
-    {
-      "identity" : "maplibre-gl-native-distribution",
-      "kind" : "remoteSourceControl",
-      "location" : "https://github.com/maplibre/maplibre-gl-native-distribution.git",
-      "state" : {
-        "revision" : "60d9bb85c94ce6e7fc4406cd32529fd12bdb7809",
-        "version" : "6.14.0"
-      }
-    },
     {
       "identity" : "sqlite-data",
       "kind" : "remoteSourceControl",
@@ -163,5 +146,5 @@
       }
     }
   ],
-  "version" : 2
+  "version" : 3
 }

mobile/ios/Runner/Sync/Messages.g.swift

@@ -183,6 +183,12 @@ enum PlatformAssetPlaybackStyle: Int {
   case videoLooping = 5
 }
 
+enum EditState: Int {
+  case notEdited = 0
+  case edited = 1
+  case unknown = 2
+}
+
 /// Generated class from Pigeon that represents data sent in messages.
 struct PlatformAsset: Hashable {
   var id: String
@@ -458,6 +464,52 @@ struct CloudIdResult: Hashable {
   }
 }
 
+/// Generated class from Pigeon that represents data sent in messages.
+struct BaseResource: Hashable {
+  var path: String
+  var sha1: String
+  var sizeBytes: Int64
+  var mimeType: String
+
+
+  // swift-format-ignore: AlwaysUseLowerCamelCase
+  static func fromList(_ pigeonVar_list: [Any?]) -> BaseResource? {
+    let path = pigeonVar_list[0] as! String
+    let sha1 = pigeonVar_list[1] as! String
+    let sizeBytes = pigeonVar_list[2] as! Int64
+    let mimeType = pigeonVar_list[3] as! String
+
+    return BaseResource(
+      path: path,
+      sha1: sha1,
+      sizeBytes: sizeBytes,
+      mimeType: mimeType
+    )
+  }
+  func toList() -> [Any?] {
+    return [
+      path,
+      sha1,
+      sizeBytes,
+      mimeType,
+    ]
+  }
+  static func == (lhs: BaseResource, rhs: BaseResource) -> Bool {
+    if Swift.type(of: lhs) != Swift.type(of: rhs) {
+      return false
+    }
+    return deepEqualsMessages(lhs.path, rhs.path) && deepEqualsMessages(lhs.sha1, rhs.sha1) && deepEqualsMessages(lhs.sizeBytes, rhs.sizeBytes) && deepEqualsMessages(lhs.mimeType, rhs.mimeType)
+  }
+
+  func hash(into hasher: inout Hasher) {
+    hasher.combine("BaseResource")
+    deepHashMessages(value: path, hasher: &hasher)
+    deepHashMessages(value: sha1, hasher: &hasher)
+    deepHashMessages(value: sizeBytes, hasher: &hasher)
+    deepHashMessages(value: mimeType, hasher: &hasher)
+  }
+}
+
 private class MessagesPigeonCodecReader: FlutterStandardReader {
   override func readValue(ofType type: UInt8) -> Any? {
     switch type {
@@ -468,15 +520,23 @@ private class MessagesPigeonCodecReader: FlutterStandardReader {
       }
       return nil
     case 130:
-      return PlatformAsset.fromList(self.readValue() as! [Any?])
+      let enumResultAsInt: Int? = nilOrValue(self.readValue() as! Int?)
+      if let enumResultAsInt = enumResultAsInt {
+        return EditState(rawValue: enumResultAsInt)
+      }
+      return nil
     case 131:
-      return PlatformAlbum.fromList(self.readValue() as! [Any?])
+      return PlatformAsset.fromList(self.readValue() as! [Any?])
     case 132:
-      return SyncDelta.fromList(self.readValue() as! [Any?])
+      return PlatformAlbum.fromList(self.readValue() as! [Any?])
     case 133:
-      return HashResult.fromList(self.readValue() as! [Any?])
+      return SyncDelta.fromList(self.readValue() as! [Any?])
     case 134:
+      return HashResult.fromList(self.readValue() as! [Any?])
+    case 135:
       return CloudIdResult.fromList(self.readValue() as! [Any?])
+    case 136:
+      return BaseResource.fromList(self.readValue() as! [Any?])
     default:
       return super.readValue(ofType: type)
     }
@@ -488,21 +548,27 @@ private class MessagesPigeonCodecWriter: FlutterStandardWriter {
     if let value = value as? PlatformAssetPlaybackStyle {
       super.writeByte(129)
       super.writeValue(value.rawValue)
-    } else if let value = value as? PlatformAsset {
+    } else if let value = value as? EditState {
       super.writeByte(130)
-      super.writeValue(value.toList())
-    } else if let value = value as? PlatformAlbum {
+      super.writeValue(value.rawValue)
+    } else if let value = value as? PlatformAsset {
       super.writeByte(131)
       super.writeValue(value.toList())
-    } else if let value = value as? SyncDelta {
+    } else if let value = value as? PlatformAlbum {
       super.writeByte(132)
       super.writeValue(value.toList())
-    } else if let value = value as? HashResult {
+    } else if let value = value as? SyncDelta {
       super.writeByte(133)
       super.writeValue(value.toList())
-    } else if let value = value as? CloudIdResult {
+    } else if let value = value as? HashResult {
       super.writeByte(134)
       super.writeValue(value.toList())
+    } else if let value = value as? CloudIdResult {
+      super.writeByte(135)
+      super.writeValue(value.toList())
+    } else if let value = value as? BaseResource {
+      super.writeByte(136)
+      super.writeValue(value.toList())
     } else {
       super.writeValue(value)
     }
@@ -539,6 +605,8 @@ protocol NativeSyncApi {
   func getTrashedAssets() throws -> [String: [PlatformAsset]]
   func restoreFromTrashById(mediaId: String, type: Int64, completion: @escaping (Result<Bool, Error>) -> Void)
   func getCloudIdForAssetIds(assetIds: [String]) throws -> [CloudIdResult]
+  func getBaseResource(assetId: String, allowNetworkAccess: Bool, completion: @escaping (Result<BaseResource?, Error>) -> Void)
+  func getEditState(assetId: String, allowNetworkAccess: Bool, completion: @escaping (Result<EditState, Error>) -> Void)
 }
 
 /// Generated setup class from Pigeon to handle messages through the `binaryMessenger`.
@@ -757,5 +825,45 @@ class NativeSyncApiSetup {
     } else {
       getCloudIdForAssetIdsChannel.setMessageHandler(nil)
     }
+    let getBaseResourceChannel = taskQueue == nil
+      ? FlutterBasicMessageChannel(name: "dev.flutter.pigeon.immich_mobile.NativeSyncApi.getBaseResource\(channelSuffix)", binaryMessenger: binaryMessenger, codec: codec)
+      : FlutterBasicMessageChannel(name: "dev.flutter.pigeon.immich_mobile.NativeSyncApi.getBaseResource\(channelSuffix)", binaryMessenger: binaryMessenger, codec: codec, taskQueue: taskQueue)
+    if let api = api {
+      getBaseResourceChannel.setMessageHandler { message, reply in
+        let args = message as! [Any?]
+        let assetIdArg = args[0] as! String
+        let allowNetworkAccessArg = args[1] as! Bool
+        api.getBaseResource(assetId: assetIdArg, allowNetworkAccess: allowNetworkAccessArg) { result in
+          switch result {
+          case .success(let res):
+            reply(wrapResult(res))
+          case .failure(let error):
+            reply(wrapError(error))
+          }
+        }
+      }
+    } else {
+      getBaseResourceChannel.setMessageHandler(nil)
+    }
+    let getEditStateChannel = taskQueue == nil
+      ? FlutterBasicMessageChannel(name: "dev.flutter.pigeon.immich_mobile.NativeSyncApi.getEditState\(channelSuffix)", binaryMessenger: binaryMessenger, codec: codec)
+      : FlutterBasicMessageChannel(name: "dev.flutter.pigeon.immich_mobile.NativeSyncApi.getEditState\(channelSuffix)", binaryMessenger: binaryMessenger, codec: codec, taskQueue: taskQueue)
+    if let api = api {
+      getEditStateChannel.setMessageHandler { message, reply in
+        let args = message as! [Any?]
+        let assetIdArg = args[0] as! String
+        let allowNetworkAccessArg = args[1] as! Bool
+        api.getEditState(assetId: assetIdArg, allowNetworkAccess: allowNetworkAccessArg) { result in
+          switch result {
+          case .success(let res):
+            reply(wrapResult(res))
+          case .failure(let error):
+            reply(wrapError(error))
+          }
+        }
+      }
+    } else {
+      getEditStateChannel.setMessageHandler(nil)
+    }
   }
 }

mobile/ios/Runner/Sync/MessagesImpl.swift

@@ -1,5 +1,6 @@
 import Photos
 import CryptoKit
+import UniformTypeIdentifiers
 
 struct AssetWrapper: Hashable, Equatable {
   let asset: PlatformAsset
@@ -419,4 +420,169 @@ class NativeSyncApiImpl: ImmichPlugin, NativeSyncApi, FlutterPlugin {
     }
     return mappings;
   }
+
+  func getBaseResource(
+    assetId: String,
+    allowNetworkAccess: Bool,
+    completion: @escaping (Result<BaseResource?, Error>) -> Void
+  ) {
+    Task { [weak self] in
+      guard let self = self else { return }
+
+      guard let asset = PHAsset.fetchAssets(withLocalIdentifiers: [assetId], options: nil).firstObject else {
+        return self.completeWhenActive(for: completion, with: .success(nil))
+      }
+
+      let resources = PHAssetResource.assetResources(for: asset)
+      let state = await Self.classifyEdit(resources: resources, allowNetworkAccess: allowNetworkAccess)
+      guard state == .edited, let original = resources.first(where: { $0.type == .photo }) else {
+        return self.completeWhenActive(for: completion, with: .success(nil))
+      }
+
+      do {
+        let result = try await self.streamBaseResource(
+          resource: original,
+          localId: asset.localIdentifier,
+          allowNetworkAccess: allowNetworkAccess
+        )
+        self.completeWhenActive(for: completion, with: .success(result))
+      } catch {
+        self.completeWhenActive(for: completion, with: .failure(error))
+      }
+    }
+  }
+
+  // Returns whether the asset carries a live Photos edit without reading the photo
+  // itself, only the small adjustment metadata. The revert probe relies on this to
+  // tell "not edited" apart from "couldn't read" (offloaded to iCloud), so it never
+  // mistakes an unreadable edit for a revert.
+  func getEditState(
+    assetId: String,
+    allowNetworkAccess: Bool,
+    completion: @escaping (Result<EditState, Error>) -> Void
+  ) {
+    Task { [weak self] in
+      guard let self = self else { return }
+      guard let asset = PHAsset.fetchAssets(withLocalIdentifiers: [assetId], options: nil).firstObject else {
+        // Not in the library, so don't answer "not edited" (the caller acts on that).
+        return self.completeWhenActive(for: completion, with: .success(.unknown))
+      }
+      let state = await Self.classifyEdit(
+        resources: PHAssetResource.assetResources(for: asset),
+        allowNetworkAccess: allowNetworkAccess
+      )
+      self.completeWhenActive(for: completion, with: .success(state))
+    }
+  }
+
+  // adjustmentRenderTypes for a photo with no real edit: a plain capture, a
+  // Photographic Style, or a reverted edit. A real edit changes this value.
+  private static let kNoEditRenderTypes = 27648
+
+  // Works out the edit state from Adjustments.plist only (never reads the photo).
+  // adjustmentRenderTypes is the signal: a real edit moves it off the baseline, while a
+  // plain capture, a Photographic Style, and a reverted edit all sit at the baseline. The
+  // editor id is NOT reliable: com.apple.camera authors both styles and some real edits
+  // (e.g. changing the Photographic Style after capture), so we key off the render types
+  // alone. Cleanup and object-removal write AdjustmentsSecondary.data, which we count as
+  // edited. unknown = couldn't read the plist (offloaded, no network).
+  private static func classifyEdit(resources: [PHAssetResource], allowNetworkAccess: Bool) async -> EditState {
+    if resources.contains(where: { $0.originalFilename == "AdjustmentsSecondary.data" }) {
+      return .edited
+    }
+    guard let adjRes = resources.first(where: { $0.originalFilename == "Adjustments.plist" }) else {
+      return .notEdited
+    }
+    guard let buf = await collectResourceData(adjRes, allowNetworkAccess: allowNetworkAccess),
+      let plist = try? PropertyListSerialization.propertyList(from: buf, options: [], format: nil) as? [String: Any]
+    else {
+      return .unknown
+    }
+    let renderTypes = (plist["adjustmentRenderTypes"] as? NSNumber)?.intValue
+    let isUserEdit = renderTypes != nil && renderTypes != kNoEditRenderTypes
+    return isUserEdit ? .edited : .notEdited
+  }
+
+  private func streamBaseResource(
+    resource: PHAssetResource,
+    localId: String,
+    allowNetworkAccess: Bool
+  ) async throws -> BaseResource {
+    let safeId = localId.replacingOccurrences(of: "/", with: "_")
+    let suffix = UTType(resource.uniformTypeIdentifier)?.preferredFilenameExtension ?? "bin"
+    let tempDir = URL(fileURLWithPath: NSTemporaryDirectory(), isDirectory: true)
+      .appendingPathComponent("immich_base", isDirectory: true)
+    try FileManager.default.createDirectory(at: tempDir, withIntermediateDirectories: true)
+
+    let unique = UUID().uuidString.prefix(8)
+    let tempUrl = tempDir.appendingPathComponent("\(safeId)_\(unique)_base.\(suffix)")
+
+    // Write the resource to disk and hash it chunk by chunk, so a big original (e.g.
+    // ProRAW) never sits fully in memory on the upload thread.
+    FileManager.default.createFile(atPath: tempUrl.path, contents: nil)
+    guard let handle = try? FileHandle(forWritingTo: tempUrl) else {
+      throw NSError(
+        domain: "NativeSyncApi",
+        code: -1,
+        userInfo: [NSLocalizedDescriptionKey: "Failed to open temp file for base resource \(localId)"]
+      )
+    }
+
+    var hasher = Insecure.SHA1()
+    var totalBytes: Int64 = 0
+    let options = PHAssetResourceRequestOptions()
+    options.isNetworkAccessAllowed = allowNetworkAccess
+
+    let succeeded = await withCheckedContinuation { (continuation: CheckedContinuation<Bool, Never>) in
+      var writeFailed = false
+      PHAssetResourceManager.default().requestData(
+        for: resource,
+        options: options,
+        dataReceivedHandler: { chunk in
+          if writeFailed { return }
+          do {
+            try handle.write(contentsOf: chunk)
+            hasher.update(data: chunk)
+            totalBytes += Int64(chunk.count)
+          } catch {
+            writeFailed = true
+          }
+        },
+        completionHandler: { error in continuation.resume(returning: error == nil && !writeFailed) }
+      )
+    }
+
+    try? handle.close()
+
+    guard succeeded else {
+      try? FileManager.default.removeItem(at: tempUrl)
+      throw NSError(
+        domain: "NativeSyncApi",
+        code: -1,
+        userInfo: [NSLocalizedDescriptionKey: "Failed to read base resource for \(localId)"]
+      )
+    }
+
+    let sha1 = Data(hasher.finalize()).base64EncodedString()
+    let mime = UTType(resource.uniformTypeIdentifier)?.preferredMIMEType ?? "application/octet-stream"
+    return BaseResource(path: tempUrl.path, sha1: sha1, sizeBytes: totalBytes, mimeType: mime)
+  }
+
+  private static func collectResourceData(
+    _ resource: PHAssetResource,
+    allowNetworkAccess: Bool
+  ) async -> Data? {
+    let options = PHAssetResourceRequestOptions()
+    options.isNetworkAccessAllowed = allowNetworkAccess
+    var buffer = Data()
+    return await withCheckedContinuation { (continuation: CheckedContinuation<Data?, Never>) in
+      PHAssetResourceManager.default().requestData(
+        for: resource,
+        options: options,
+        dataReceivedHandler: { data in buffer.append(data) },
+        completionHandler: { error in continuation.resume(returning: error == nil ? buffer : nil) }
+      )
+    }
+  }
+
 }

mobile/lib/constants/constants.dart

@@ -20,6 +20,7 @@ const String kSecuredPinCode = "secured_pin_code";
 const String kManualUploadGroup = 'manual_upload_group';
 const String kBackupGroup = 'backup_group';
 const String kBackupLivePhotoGroup = 'backup_live_photo_group';
+const String kBackupEditPairGroup = 'backup_edit_pair_group';
 const String kDownloadGroupImage = 'group_image';
 const String kDownloadGroupVideo = 'group_video';
 const String kDownloadGroupLivePhoto = 'group_livephoto';

mobile/lib/domain/models/asset/local_asset.model.dart

@@ -12,6 +12,13 @@ class LocalAsset extends BaseAsset {
   final double? latitude;
   final double? longitude;
 
+  // Remote id of this asset's previous upload; used to stack a new edit under it.
+  final String? priorRemoteId;
+
+  // Local checksum at the last sync action; lets backup skip an already-handled
+  // local whose current render hashes fresh (the iOS revert case).
+  final String? syncedChecksum;
+
   const LocalAsset({
     required this.id,
     String? remoteId,
@@ -32,6 +39,8 @@ class LocalAsset extends BaseAsset {
     this.latitude,
     this.longitude,
     required super.isEdited,
+    this.priorRemoteId,
+    this.syncedChecksum,
   }) : remoteAssetId = remoteId;
 
   @override
@@ -120,6 +129,8 @@ class LocalAsset extends BaseAsset {
     double? latitude,
     double? longitude,
     bool? isEdited,
+    String? priorRemoteId,
+    String? syncedChecksum,
   }) {
     return LocalAsset(
       id: id ?? this.id,
@@ -140,6 +151,8 @@ class LocalAsset extends BaseAsset {
       latitude: latitude ?? this.latitude,
       longitude: longitude ?? this.longitude,
       isEdited: isEdited ?? this.isEdited,
+      priorRemoteId: priorRemoteId ?? this.priorRemoteId,
+      syncedChecksum: syncedChecksum ?? this.syncedChecksum,
     );
   }
 }

mobile/lib/domain/services/asset.service.dart

@@ -8,7 +8,11 @@ class AssetService {
   final RemoteAssetRepository _remoteAssetRepository;
   final DriftLocalAssetRepository _localAssetRepository;
 
-  const AssetService({required this._remoteAssetRepository, required this._localAssetRepository});
+  const AssetService({
+    required RemoteAssetRepository remoteAssetRepository,
+    required DriftLocalAssetRepository localAssetRepository,
+  }) : _remoteAssetRepository = remoteAssetRepository,
+       _localAssetRepository = localAssetRepository;
 
   Future<BaseAsset?> getAsset(BaseAsset asset) {
     final id = asset is LocalAsset ? asset.id : (asset as RemoteAsset).id;

mobile/lib/domain/services/background_worker.service.dart

@@ -61,9 +61,11 @@ class BackgroundWorkerBgService extends BackgroundWorkerFlutterApi {
 
   bool _isCleanedUp = false;
 
-  BackgroundWorkerBgService({required this._drift, required this._driftLogger})
-    : _backgroundHostApi = BackgroundWorkerBgHostApi() {
-    _ref = ProviderContainer(overrides: [driftProvider.overrideWith(driftOverride(_drift))]);
+  BackgroundWorkerBgService({required Drift drift, required DriftLogger driftLogger})
+    : _drift = drift,
+      _driftLogger = driftLogger,
+      _backgroundHostApi = BackgroundWorkerBgHostApi() {
+    _ref = ProviderContainer(overrides: [driftProvider.overrideWith(driftOverride(drift))]);
     BackgroundWorkerFlutterApi.setUp(this);
   }
 

mobile/lib/domain/services/edit_revert.service.dart

@@ -0,0 +1,87 @@
+import 'dart:async';
+
+import 'package:immich_mobile/domain/models/asset/base_asset.model.dart';
+import 'package:immich_mobile/infrastructure/repositories/local_asset.repository.dart';
+import 'package:immich_mobile/infrastructure/repositories/stack.repository.dart';
+import 'package:immich_mobile/platform/native_sync_api.g.dart';
+import 'package:immich_mobile/repositories/asset_api.repository.dart';
+import 'package:logging/logging.dart';
+
+/// Handles an edit that was reverted in Photos. The local was uploaded as an edit
+/// before but isn't edited now, so flip the stack primary back to the original (via
+/// prior_remote_id) and mark it handled so we don't re-upload the reverted render.
+/// Nothing is trashed; all the edits stay in the stack.
+class EditRevertService {
+  final NativeSyncApi _nativeSyncApi;
+  final DriftStackRepository _stackRepository;
+  final DriftLocalAssetRepository _localAssetRepository;
+  final AssetApiRepository _assetApiRepository;
+  final _log = Logger('EditRevertService');
+
+  EditRevertService({
+    required NativeSyncApi nativeSyncApi,
+    required DriftStackRepository stackRepository,
+    required DriftLocalAssetRepository localAssetRepository,
+    required AssetApiRepository assetApiRepository,
+  }) : _nativeSyncApi = nativeSyncApi,
+       _stackRepository = stackRepository,
+       _localAssetRepository = localAssetRepository,
+       _assetApiRepository = assetApiRepository;
+
+  /// Returns true if the asset was a revert and was handled (caller skips the
+  /// upload); false to fall through to the normal upload path.
+  Future<bool> tryHandleRevert(LocalAsset asset) async {
+    if (asset.priorRemoteId == null) {
+      return false;
+    }
+
+    // Only "not edited" is a revert. `edited` is a fresh edit, so let the pair flow
+    // take it. `unknown` means we couldn't read the adjustment (offloaded to iCloud,
+    // network off); bail there too instead of mistaking an unreadable edit for a
+    // revert and flipping the stack. Network off keeps this a cheap offline read.
+    try {
+      final editState = await _nativeSyncApi.getEditState(asset.id, allowNetworkAccess: false);
+      if (editState != EditState.notEdited) {
+        return false;
+      }
+    } catch (error, stack) {
+      _log.warning("edit-state probe failed for ${asset.id}", error, stack);
+      return false;
+    }
+
+    // It's a revert. Styled photos hit this path because iOS re-encodes the revert to
+    // fresh bytes, so it looks like a new backup candidate and reaches upload.
+    // Non-styled reverts hash back to the base instead, aren't candidates, and get
+    // flipped at hash time in HashService._reconcileReverts. Fresh bytes match nothing
+    // remote, so flip by structure: prior_remote_id is the current primary (the latest
+    // edit), flip it back to the base.
+    final String stackId;
+    final String baseId;
+    try {
+      final foundStack = await _stackRepository.findStackIdByRemoteId(asset.priorRemoteId!);
+      if (foundStack == null) {
+        return false;
+      }
+      final base = await _stackRepository.findStackBaseId(foundStack, excludeId: asset.priorRemoteId!);
+      if (base == null) {
+        return false;
+      }
+      stackId = foundStack;
+      baseId = base;
+    } catch (error, stack) {
+      _log.warning("revert stack lookup failed for ${asset.id}", error, stack);
+      return false;
+    }
+
+    try {
+      await _assetApiRepository.setStackPrimary(stackId, baseId);
+      await _stackRepository.setPrimary(stackId, baseId);
+      await _localAssetRepository.markSynced(asset.id, priorRemoteId: baseId, syncedChecksum: asset.checksum ?? '');
+    } catch (error, stack) {
+      _log.warning("revert primary flip failed for ${asset.id}", error, stack);
+      return false;
+    }
+
+    return true;
+  }
+}

mobile/lib/domain/services/hash.service.dart

@@ -5,8 +5,10 @@ import 'package:immich_mobile/domain/models/asset/base_asset.model.dart';
 import 'package:immich_mobile/extensions/platform_extensions.dart';
 import 'package:immich_mobile/infrastructure/repositories/local_album.repository.dart';
 import 'package:immich_mobile/infrastructure/repositories/local_asset.repository.dart';
+import 'package:immich_mobile/infrastructure/repositories/stack.repository.dart';
 import 'package:immich_mobile/infrastructure/repositories/trashed_local_asset.repository.dart';
 import 'package:immich_mobile/platform/native_sync_api.g.dart';
+import 'package:immich_mobile/repositories/asset_api.repository.dart';
 import 'package:logging/logging.dart';
 
 const String _kHashCancelledCode = "HASH_CANCELLED";
@@ -17,17 +19,28 @@ class HashService {
   final DriftLocalAssetRepository _localAssetRepository;
   final DriftTrashedLocalAssetRepository _trashedLocalAssetRepository;
   final NativeSyncApi _nativeSyncApi;
+  final DriftStackRepository _stackRepository;
+  final AssetApiRepository _assetApiRepository;
   final bool Function()? _cancelChecker;
   final _log = Logger('HashService');
 
   HashService({
-    required this._localAlbumRepository,
-    required this._localAssetRepository,
-    required this._trashedLocalAssetRepository,
-    required this._nativeSyncApi,
-    this._cancelChecker,
+    required DriftLocalAlbumRepository localAlbumRepository,
+    required DriftLocalAssetRepository localAssetRepository,
+    required DriftTrashedLocalAssetRepository trashedLocalAssetRepository,
+    required NativeSyncApi nativeSyncApi,
+    required DriftStackRepository stackRepository,
+    required AssetApiRepository assetApiRepository,
+    bool Function()? cancelChecker,
     int? batchSize,
-  }) : _batchSize = batchSize ?? kBatchHashFileLimit;
+  }) : _localAlbumRepository = localAlbumRepository,
+       _localAssetRepository = localAssetRepository,
+       _trashedLocalAssetRepository = trashedLocalAssetRepository,
+       _cancelChecker = cancelChecker,
+       _nativeSyncApi = nativeSyncApi,
+       _stackRepository = stackRepository,
+       _assetApiRepository = assetApiRepository,
+       _batchSize = batchSize ?? kBatchHashFileLimit;
 
   bool get isCancelled => _cancelChecker?.call() ?? false;
 
@@ -40,6 +53,7 @@ class HashService {
 
       // Sorted by backupSelection followed by isCloud
       final localAlbums = await _localAlbumRepository.getBackupAlbums();
+      final hashedIds = <String>{};
 
       for (final album in localAlbums) {
         if (isCancelled) {
@@ -49,7 +63,7 @@ class HashService {
 
         final assetsToHash = await _localAlbumRepository.getAssetsToHash(album.id);
         if (assetsToHash.isNotEmpty) {
-          await _hashAssets(album, assetsToHash);
+          await _hashAssets(album, assetsToHash, hashedIds: hashedIds);
         }
       }
       if (CurrentPlatform.isAndroid && localAlbums.isNotEmpty) {
@@ -57,9 +71,18 @@ class HashService {
         final trashedToHash = await _trashedLocalAssetRepository.getAssetsToHash(backupAlbumIds);
         if (trashedToHash.isNotEmpty) {
           final pseudoAlbum = LocalAlbum(id: '-pseudoAlbum', name: 'Trash', updatedAt: DateTime.now());
-          await _hashAssets(pseudoAlbum, trashedToHash, isTrashed: true);
+          await _hashAssets(pseudoAlbum, trashedToHash, isTrashed: true, hashedIds: hashedIds);
         }
       }
+
+      // Revert reconcile for non-styled photos: the reverted edit hashes back to the
+      // original's exact bytes, which are already the stack base, so it's not a backup
+      // candidate and never reaches upload. Flip the primary here. Styled photos
+      // re-encode to fresh bytes and get flipped on the upload path instead
+      // (EditRevertService.tryHandleRevert).
+      if (CurrentPlatform.isIOS && hashedIds.isNotEmpty && !isCancelled) {
+        await _reconcileReverts(hashedIds);
+      }
     } on PlatformException catch (e) {
       if (e.code == _kHashCancelledCode) {
         _log.warning("Hashing cancelled by platform");
@@ -76,7 +99,12 @@ class HashService {
   /// Processes a list of [LocalAsset]s, storing their hash and updating the assets in the DB
   /// with hash for those that were successfully hashed. Hashes are looked up in a table
   /// [LocalAssetHashEntity] by local id. Only missing entries are newly hashed and added to the DB.
-  Future<void> _hashAssets(LocalAlbum album, List<LocalAsset> assetsToHash, {bool isTrashed = false}) async {
+  Future<void> _hashAssets(
+    LocalAlbum album,
+    List<LocalAsset> assetsToHash, {
+    bool isTrashed = false,
+    required Set<String> hashedIds,
+  }) async {
     final toHash = <String, LocalAsset>{};
 
     for (final asset in assetsToHash) {
@@ -87,16 +115,21 @@ class HashService {
 
       toHash[asset.id] = asset;
       if (toHash.length == _batchSize) {
-        await _processBatch(album, toHash, isTrashed);
+        await _processBatch(album, toHash, isTrashed, hashedIds);
         toHash.clear();
       }
     }
 
-    await _processBatch(album, toHash, isTrashed);
+    await _processBatch(album, toHash, isTrashed, hashedIds);
   }
 
   /// Processes a batch of assets.
-  Future<void> _processBatch(LocalAlbum album, Map<String, LocalAsset> toHash, bool isTrashed) async {
+  Future<void> _processBatch(
+    LocalAlbum album,
+    Map<String, LocalAsset> toHash,
+    bool isTrashed,
+    Set<String> hashedIds,
+  ) async {
     if (toHash.isEmpty) {
       return;
     }
@@ -136,5 +169,33 @@ class HashService {
     } else {
       await _localAssetRepository.updateHashes(hashed);
     }
+    hashedIds.addAll(hashed.keys);
+  }
+
+  Future<void> _reconcileReverts(Set<String> localIds) async {
+    final List<StackReconcileTarget> targets;
+    try {
+      targets = await _stackRepository.findRevertReconcileTargets(localIds);
+    } catch (error, stack) {
+      _log.warning("findRevertReconcileTargets failed", error, stack);
+      return;
+    }
+
+    for (final target in targets) {
+      try {
+        await _assetApiRepository.setStackPrimary(target.stackId, target.newPrimaryId);
+        await _stackRepository.setPrimary(target.stackId, target.newPrimaryId);
+        // Roll priorRemoteId forward to the matched member (now the primary) so a
+        // later edit stacks onto THAT (the current render), not the old edit.
+        await _localAssetRepository.markSynced(
+          target.localAssetId,
+          priorRemoteId: target.newPrimaryId,
+          syncedChecksum: target.localAssetChecksum,
+        );
+      } catch (error, stack) {
+        _log.warning("revert reconcile flip failed for stack ${target.stackId}", error, stack);
+        continue;
+      }
+    }
   }
 }

mobile/lib/domain/services/local_sync.service.dart

@@ -28,13 +28,18 @@ class LocalSyncService {
   final Logger _log = Logger("DeviceSyncService");
 
   LocalSyncService({
-    required this._localAlbumRepository,
-    required this._localAssetRepository,
-    required this._nativeSyncApi,
-    required this._trashedLocalAssetRepository,
-    required this._assetMediaRepository,
-    required this._permissionRepository,
-  });
+    required DriftLocalAlbumRepository localAlbumRepository,
+    required DriftLocalAssetRepository localAssetRepository,
+    required DriftTrashedLocalAssetRepository trashedLocalAssetRepository,
+    required AssetMediaRepository assetMediaRepository,
+    required IPermissionRepository permissionRepository,
+    required NativeSyncApi nativeSyncApi,
+  }) : _localAlbumRepository = localAlbumRepository,
+       _localAssetRepository = localAssetRepository,
+       _trashedLocalAssetRepository = trashedLocalAssetRepository,
+       _assetMediaRepository = assetMediaRepository,
+       _permissionRepository = permissionRepository,
+       _nativeSyncApi = nativeSyncApi;
 
   Future<void> sync({bool full = false}) async {
     final Stopwatch stopwatch = Stopwatch()..start();

mobile/lib/domain/services/map.service.dart

@@ -10,7 +10,7 @@ typedef MapQuery = ({MapMarkerSource markerSource});
 class MapFactory {
   final DriftMapRepository _mapRepository;
 
-  const MapFactory({required this._mapRepository});
+  const MapFactory({required DriftMapRepository mapRepository}) : _mapRepository = mapRepository;
 
   MapService remote(List<String> ownerIds, TimelineMapOptions options) =>
       MapService(_mapRepository.remote(ownerIds, options));

mobile/lib/domain/services/setting.service.dart

@@ -9,7 +9,7 @@ final AppSetting = SettingsService(storeService: StoreService.I);
 class SettingsService {
   final StoreService _storeService;
 
-  const SettingsService({required this._storeService});
+  const SettingsService({required StoreService storeService}) : _storeService = storeService;
 
   T get<T>(Setting<T> setting) => _storeService.get(setting.storeKey, setting.defaultValue);
 

mobile/lib/domain/services/sync_stream.service.dart

@@ -41,16 +41,24 @@ class SyncStreamService {
   final bool Function()? _cancelChecker;
 
   SyncStreamService({
-    required this._syncApiRepository,
-    required this._syncStreamRepository,
-    required this._localAssetRepository,
-    required this._trashedLocalAssetRepository,
-    required this._assetMediaRepository,
-    required this._permissionRepository,
-    required this._syncMigrationRepository,
-    required this._api,
-    this._cancelChecker,
-  });
+    required SyncApiRepository syncApiRepository,
+    required SyncStreamRepository syncStreamRepository,
+    required DriftLocalAssetRepository localAssetRepository,
+    required DriftTrashedLocalAssetRepository trashedLocalAssetRepository,
+    required AssetMediaRepository assetMediaRepository,
+    required IPermissionRepository permissionRepository,
+    required SyncMigrationRepository syncMigrationRepository,
+    required ApiService api,
+    bool Function()? cancelChecker,
+  }) : _syncApiRepository = syncApiRepository,
+       _syncStreamRepository = syncStreamRepository,
+       _localAssetRepository = localAssetRepository,
+       _trashedLocalAssetRepository = trashedLocalAssetRepository,
+       _assetMediaRepository = assetMediaRepository,
+       _permissionRepository = permissionRepository,
+       _syncMigrationRepository = syncMigrationRepository,
+       _api = api,
+       _cancelChecker = cancelChecker;
 
   bool get isCancelled => _cancelChecker?.call() ?? false;
 

mobile/lib/domain/services/timeline.service.dart

@@ -41,7 +41,11 @@ class TimelineFactory {
   final DriftTimelineRepository _timelineRepository;
   final MetadataRepository _metadataRepository;
 
-  const TimelineFactory({required this._timelineRepository, required this._metadataRepository});
+  const TimelineFactory({
+    required DriftTimelineRepository timelineRepository,
+    required MetadataRepository metadataRepository,
+  }) : _timelineRepository = timelineRepository,
+       _metadataRepository = metadataRepository;
 
   GroupAssetsBy get groupBy {
     final group = _metadataRepository.appConfig.timeline.groupAssetsBy;
@@ -104,7 +108,12 @@ class TimelineService {
   TimelineService(TimelineQuery query)
     : this._(assetSource: query.assetSource, bucketSource: query.bucketSource, origin: query.origin);
 
-  TimelineService._({required this._assetSource, required this._bucketSource, required this.origin}) {
+  TimelineService._({
+    required TimelineAssetSource assetSource,
+    required TimelineBucketSource bucketSource,
+    required this.origin,
+  }) : _assetSource = assetSource,
+       _bucketSource = bucketSource {
     _bucketSubscription = _bucketSource().listen((buckets) {
       _mutex.run(() async {
         final totalAssets = buckets.fold<int>(0, (acc, bucket) => acc + bucket.assetCount);

mobile/lib/domain/services/user.service.dart

@@ -12,7 +12,9 @@ class UserService {
   final UserApiRepository _userApiRepository;
   final StoreService _storeService;
 
-  UserService({required this._userApiRepository, required this._storeService});
+  UserService({required UserApiRepository userApiRepository, required StoreService storeService})
+    : _userApiRepository = userApiRepository,
+      _storeService = storeService;
 
   UserDto getMyUser() {
     return _storeService.get(StoreKey.currentUser);

mobile/lib/domain/utils/background_sync.dart

@@ -81,6 +81,10 @@ class BackgroundSyncManager {
     } on CanceledError {
       // Ignore cancellation errors
     }
+
+    // Stop the local-sync and hash slots too. The revert reconcile runs in the hash
+    // task and shouldn't outlive the session.
+    await cancelLocal();
   }
 
   Future<void> cancelLocal() async {
@@ -186,6 +190,22 @@ class BackgroundSyncManager {
         });
   }
 
+  /// Runs a remote sync guaranteed to observe changes up to now. [syncRemote]
+  /// joins an in-flight sync whose snapshot can pre-date a just-received change
+  /// (e.g. a stack update) and miss it, so wait for any in-flight sync to finish
+  /// first, then run a fresh one.
+  Future<void> runFreshRemoteSync() async {
+    final inflight = _syncTask;
+    if (inflight != null) {
+      try {
+        await inflight.future;
+      } catch (_) {
+        // The in-flight sync's outcome doesn't matter; we only need a fresh one after it.
+      }
+    }
+    await syncRemote();
+  }
+
   Future<void> syncWebsocketBatchV1(List<dynamic> batchData) {
     if (_syncWebsocketTask != null) {
       return _syncWebsocketTask!.future;

mobile/lib/infrastructure/entities/local_asset.entity.dart

@@ -6,6 +6,7 @@ import 'package:immich_mobile/infrastructure/utils/drift_default.mixin.dart';
 
 @TableIndex.sql('CREATE INDEX IF NOT EXISTS idx_local_asset_checksum ON local_asset_entity (checksum)')
 @TableIndex.sql('CREATE INDEX IF NOT EXISTS idx_local_asset_cloud_id ON local_asset_entity (i_cloud_id)')
+@TableIndex.sql('CREATE INDEX IF NOT EXISTS idx_local_asset_prior_remote_id ON local_asset_entity (prior_remote_id)')
 class LocalAssetEntity extends Table with DriftDefaultsMixin, AssetEntityMixin {
   const LocalAssetEntity();
 
@@ -27,6 +28,14 @@ class LocalAssetEntity extends Table with DriftDefaultsMixin, AssetEntityMixin {
 
   IntColumn get playbackStyle => intEnum<AssetPlaybackStyle>().withDefault(const Constant(0))();
 
+  // remote id of the previous upload (iOS edit-pair stacking)
+  TextColumn get priorRemoteId => text().nullable()();
+
+  // local checksum at the last sync action. Lets the backup query skip a local
+  // whose current hash matches nothing remote but is still "handled": the iOS
+  // revert case, where the reverted render hashes fresh but is already reconciled.
+  TextColumn get syncedChecksum => text().nullable()();
+
   @override
   Set<Column> get primaryKey => {id};
 }
@@ -51,5 +60,7 @@ extension LocalAssetEntityDataDomainExtension on LocalAssetEntityData {
     longitude: longitude,
     cloudId: iCloudId,
     isEdited: false,
+    priorRemoteId: priorRemoteId,
+    syncedChecksum: syncedChecksum,
   );
 }

mobile/lib/infrastructure/entities/local_asset.entity.drift.dart

@@ -26,6 +26,8 @@ typedef $$LocalAssetEntityTableCreateCompanionBuilder =
       i0.Value<double?> latitude,
       i0.Value<double?> longitude,
       i0.Value<i2.AssetPlaybackStyle> playbackStyle,
+      i0.Value<String?> priorRemoteId,
+      i0.Value<String?> syncedChecksum,
     });
 typedef $$LocalAssetEntityTableUpdateCompanionBuilder =
     i1.LocalAssetEntityCompanion Function({
@@ -45,6 +47,8 @@ typedef $$LocalAssetEntityTableUpdateCompanionBuilder =
       i0.Value<double?> latitude,
       i0.Value<double?> longitude,
       i0.Value<i2.AssetPlaybackStyle> playbackStyle,
+      i0.Value<String?> priorRemoteId,
+      i0.Value<String?> syncedChecksum,
     });
 
 class $$LocalAssetEntityTableFilterComposer
@@ -141,6 +145,16 @@ class $$LocalAssetEntityTableFilterComposer
     column: $table.playbackStyle,
     builder: (column) => i0.ColumnWithTypeConverterFilters(column),
   );
+
+  i0.ColumnFilters<String> get priorRemoteId => $composableBuilder(
+    column: $table.priorRemoteId,
+    builder: (column) => i0.ColumnFilters(column),
+  );
+
+  i0.ColumnFilters<String> get syncedChecksum => $composableBuilder(
+    column: $table.syncedChecksum,
+    builder: (column) => i0.ColumnFilters(column),
+  );
 }
 
 class $$LocalAssetEntityTableOrderingComposer
@@ -231,6 +245,16 @@ class $$LocalAssetEntityTableOrderingComposer
     column: $table.playbackStyle,
     builder: (column) => i0.ColumnOrderings(column),
   );
+
+  i0.ColumnOrderings<String> get priorRemoteId => $composableBuilder(
+    column: $table.priorRemoteId,
+    builder: (column) => i0.ColumnOrderings(column),
+  );
+
+  i0.ColumnOrderings<String> get syncedChecksum => $composableBuilder(
+    column: $table.syncedChecksum,
+    builder: (column) => i0.ColumnOrderings(column),
+  );
 }
 
 class $$LocalAssetEntityTableAnnotationComposer
@@ -300,6 +324,16 @@ class $$LocalAssetEntityTableAnnotationComposer
     column: $table.playbackStyle,
     builder: (column) => column,
   );
+
+  i0.GeneratedColumn<String> get priorRemoteId => $composableBuilder(
+    column: $table.priorRemoteId,
+    builder: (column) => column,
+  );
+
+  i0.GeneratedColumn<String> get syncedChecksum => $composableBuilder(
+    column: $table.syncedChecksum,
+    builder: (column) => column,
+  );
 }
 
 class $$LocalAssetEntityTableTableManager
@@ -359,6 +393,8 @@ class $$LocalAssetEntityTableTableManager
                 i0.Value<double?> longitude = const i0.Value.absent(),
                 i0.Value<i2.AssetPlaybackStyle> playbackStyle =
                     const i0.Value.absent(),
+                i0.Value<String?> priorRemoteId = const i0.Value.absent(),
+                i0.Value<String?> syncedChecksum = const i0.Value.absent(),
               }) => i1.LocalAssetEntityCompanion(
                 name: name,
                 type: type,
@@ -376,6 +412,8 @@ class $$LocalAssetEntityTableTableManager
                 latitude: latitude,
                 longitude: longitude,
                 playbackStyle: playbackStyle,
+                priorRemoteId: priorRemoteId,
+                syncedChecksum: syncedChecksum,
               ),
           createCompanionCallback:
               ({
@@ -396,6 +434,8 @@ class $$LocalAssetEntityTableTableManager
                 i0.Value<double?> longitude = const i0.Value.absent(),
                 i0.Value<i2.AssetPlaybackStyle> playbackStyle =
                     const i0.Value.absent(),
+                i0.Value<String?> priorRemoteId = const i0.Value.absent(),
+                i0.Value<String?> syncedChecksum = const i0.Value.absent(),
               }) => i1.LocalAssetEntityCompanion.insert(
                 name: name,
                 type: type,
@@ -413,6 +453,8 @@ class $$LocalAssetEntityTableTableManager
                 latitude: latitude,
                 longitude: longitude,
                 playbackStyle: playbackStyle,
+                priorRemoteId: priorRemoteId,
+                syncedChecksum: syncedChecksum,
               ),
           withReferenceMapper: (p0) => p0
               .map((e) => (e.readTable(table), i0.BaseReferences(db, table, e)))
@@ -637,6 +679,28 @@ class $LocalAssetEntityTable extends i3.LocalAssetEntity
       ).withConverter<i2.AssetPlaybackStyle>(
         i1.$LocalAssetEntityTable.$converterplaybackStyle,
       );
+  static const i0.VerificationMeta _priorRemoteIdMeta =
+      const i0.VerificationMeta('priorRemoteId');
+  @override
+  late final i0.GeneratedColumn<String> priorRemoteId =
+      i0.GeneratedColumn<String>(
+        'prior_remote_id',
+        aliasedName,
+        true,
+        type: i0.DriftSqlType.string,
+        requiredDuringInsert: false,
+      );
+  static const i0.VerificationMeta _syncedChecksumMeta =
+      const i0.VerificationMeta('syncedChecksum');
+  @override
+  late final i0.GeneratedColumn<String> syncedChecksum =
+      i0.GeneratedColumn<String>(
+        'synced_checksum',
+        aliasedName,
+        true,
+        type: i0.DriftSqlType.string,
+        requiredDuringInsert: false,
+      );
   @override
   List<i0.GeneratedColumn> get $columns => [
     name,
@@ -655,6 +719,8 @@ class $LocalAssetEntityTable extends i3.LocalAssetEntity
     latitude,
     longitude,
     playbackStyle,
+    priorRemoteId,
+    syncedChecksum,
   ];
   @override
   String get aliasedName => _alias ?? actualTableName;
@@ -759,6 +825,24 @@ class $LocalAssetEntityTable extends i3.LocalAssetEntity
         longitude.isAcceptableOrUnknown(data['longitude']!, _longitudeMeta),
       );
     }
+    if (data.containsKey('prior_remote_id')) {
+      context.handle(
+        _priorRemoteIdMeta,
+        priorRemoteId.isAcceptableOrUnknown(
+          data['prior_remote_id']!,
+          _priorRemoteIdMeta,
+        ),
+      );
+    }
+    if (data.containsKey('synced_checksum')) {
+      context.handle(
+        _syncedChecksumMeta,
+        syncedChecksum.isAcceptableOrUnknown(
+          data['synced_checksum']!,
+          _syncedChecksumMeta,
+        ),
+      );
+    }
     return context;
   }
 
@@ -839,6 +923,14 @@ class $LocalAssetEntityTable extends i3.LocalAssetEntity
           data['${effectivePrefix}playback_style'],
         )!,
       ),
+      priorRemoteId: attachedDatabase.typeMapping.read(
+        i0.DriftSqlType.string,
+        data['${effectivePrefix}prior_remote_id'],
+      ),
+      syncedChecksum: attachedDatabase.typeMapping.read(
+        i0.DriftSqlType.string,
+        data['${effectivePrefix}synced_checksum'],
+      ),
     );
   }
 
@@ -877,6 +969,8 @@ class LocalAssetEntityData extends i0.DataClass
   final double? latitude;
   final double? longitude;
   final i2.AssetPlaybackStyle playbackStyle;
+  final String? priorRemoteId;
+  final String? syncedChecksum;
   const LocalAssetEntityData({
     required this.name,
     required this.type,
@@ -894,6 +988,8 @@ class LocalAssetEntityData extends i0.DataClass
     this.latitude,
     this.longitude,
     required this.playbackStyle,
+    this.priorRemoteId,
+    this.syncedChecksum,
   });
   @override
   Map<String, i0.Expression> toColumns(bool nullToAbsent) {
@@ -938,6 +1034,12 @@ class LocalAssetEntityData extends i0.DataClass
         i1.$LocalAssetEntityTable.$converterplaybackStyle.toSql(playbackStyle),
       );
     }
+    if (!nullToAbsent || priorRemoteId != null) {
+      map['prior_remote_id'] = i0.Variable<String>(priorRemoteId);
+    }
+    if (!nullToAbsent || syncedChecksum != null) {
+      map['synced_checksum'] = i0.Variable<String>(syncedChecksum);
+    }
     return map;
   }
 
@@ -967,6 +1069,8 @@ class LocalAssetEntityData extends i0.DataClass
       playbackStyle: i1.$LocalAssetEntityTable.$converterplaybackStyle.fromJson(
         serializer.fromJson<int>(json['playbackStyle']),
       ),
+      priorRemoteId: serializer.fromJson<String?>(json['priorRemoteId']),
+      syncedChecksum: serializer.fromJson<String?>(json['syncedChecksum']),
     );
   }
   @override
@@ -993,6 +1097,8 @@ class LocalAssetEntityData extends i0.DataClass
       'playbackStyle': serializer.toJson<int>(
         i1.$LocalAssetEntityTable.$converterplaybackStyle.toJson(playbackStyle),
       ),
+      'priorRemoteId': serializer.toJson<String?>(priorRemoteId),
+      'syncedChecksum': serializer.toJson<String?>(syncedChecksum),
     };
   }
 
@@ -1013,6 +1119,8 @@ class LocalAssetEntityData extends i0.DataClass
     i0.Value<double?> latitude = const i0.Value.absent(),
     i0.Value<double?> longitude = const i0.Value.absent(),
     i2.AssetPlaybackStyle? playbackStyle,
+    i0.Value<String?> priorRemoteId = const i0.Value.absent(),
+    i0.Value<String?> syncedChecksum = const i0.Value.absent(),
   }) => i1.LocalAssetEntityData(
     name: name ?? this.name,
     type: type ?? this.type,
@@ -1032,6 +1140,12 @@ class LocalAssetEntityData extends i0.DataClass
     latitude: latitude.present ? latitude.value : this.latitude,
     longitude: longitude.present ? longitude.value : this.longitude,
     playbackStyle: playbackStyle ?? this.playbackStyle,
+    priorRemoteId: priorRemoteId.present
+        ? priorRemoteId.value
+        : this.priorRemoteId,
+    syncedChecksum: syncedChecksum.present
+        ? syncedChecksum.value
+        : this.syncedChecksum,
   );
   LocalAssetEntityData copyWithCompanion(i1.LocalAssetEntityCompanion data) {
     return LocalAssetEntityData(
@@ -1061,6 +1175,12 @@ class LocalAssetEntityData extends i0.DataClass
       playbackStyle: data.playbackStyle.present
           ? data.playbackStyle.value
           : this.playbackStyle,
+      priorRemoteId: data.priorRemoteId.present
+          ? data.priorRemoteId.value
+          : this.priorRemoteId,
+      syncedChecksum: data.syncedChecksum.present
+          ? data.syncedChecksum.value
+          : this.syncedChecksum,
     );
   }
 
@@ -1082,7 +1202,9 @@ class LocalAssetEntityData extends i0.DataClass
           ..write('adjustmentTime: $adjustmentTime, ')
           ..write('latitude: $latitude, ')
           ..write('longitude: $longitude, ')
-          ..write('playbackStyle: $playbackStyle')
+          ..write('playbackStyle: $playbackStyle, ')
+          ..write('priorRemoteId: $priorRemoteId, ')
+          ..write('syncedChecksum: $syncedChecksum')
           ..write(')'))
         .toString();
   }
@@ -1105,6 +1227,8 @@ class LocalAssetEntityData extends i0.DataClass
     latitude,
     longitude,
     playbackStyle,
+    priorRemoteId,
+    syncedChecksum,
   );
   @override
   bool operator ==(Object other) =>
@@ -1125,7 +1249,9 @@ class LocalAssetEntityData extends i0.DataClass
           other.adjustmentTime == this.adjustmentTime &&
           other.latitude == this.latitude &&
           other.longitude == this.longitude &&
-          other.playbackStyle == this.playbackStyle);
+          other.playbackStyle == this.playbackStyle &&
+          other.priorRemoteId == this.priorRemoteId &&
+          other.syncedChecksum == this.syncedChecksum);
 }
 
 class LocalAssetEntityCompanion
@@ -1146,6 +1272,8 @@ class LocalAssetEntityCompanion
   final i0.Value<double?> latitude;
   final i0.Value<double?> longitude;
   final i0.Value<i2.AssetPlaybackStyle> playbackStyle;
+  final i0.Value<String?> priorRemoteId;
+  final i0.Value<String?> syncedChecksum;
   const LocalAssetEntityCompanion({
     this.name = const i0.Value.absent(),
     this.type = const i0.Value.absent(),
@@ -1163,6 +1291,8 @@ class LocalAssetEntityCompanion
     this.latitude = const i0.Value.absent(),
     this.longitude = const i0.Value.absent(),
     this.playbackStyle = const i0.Value.absent(),
+    this.priorRemoteId = const i0.Value.absent(),
+    this.syncedChecksum = const i0.Value.absent(),
   });
   LocalAssetEntityCompanion.insert({
     required String name,
@@ -1181,6 +1311,8 @@ class LocalAssetEntityCompanion
     this.latitude = const i0.Value.absent(),
     this.longitude = const i0.Value.absent(),
     this.playbackStyle = const i0.Value.absent(),
+    this.priorRemoteId = const i0.Value.absent(),
+    this.syncedChecksum = const i0.Value.absent(),
   }) : name = i0.Value(name),
        type = i0.Value(type),
        id = i0.Value(id);
@@ -1201,6 +1333,8 @@ class LocalAssetEntityCompanion
     i0.Expression<double>? latitude,
     i0.Expression<double>? longitude,
     i0.Expression<int>? playbackStyle,
+    i0.Expression<String>? priorRemoteId,
+    i0.Expression<String>? syncedChecksum,
   }) {
     return i0.RawValuesInsertable({
       if (name != null) 'name': name,
@@ -1219,6 +1353,8 @@ class LocalAssetEntityCompanion
       if (latitude != null) 'latitude': latitude,
       if (longitude != null) 'longitude': longitude,
       if (playbackStyle != null) 'playback_style': playbackStyle,
+      if (priorRemoteId != null) 'prior_remote_id': priorRemoteId,
+      if (syncedChecksum != null) 'synced_checksum': syncedChecksum,
     });
   }
 
@@ -1239,6 +1375,8 @@ class LocalAssetEntityCompanion
     i0.Value<double?>? latitude,
     i0.Value<double?>? longitude,
     i0.Value<i2.AssetPlaybackStyle>? playbackStyle,
+    i0.Value<String?>? priorRemoteId,
+    i0.Value<String?>? syncedChecksum,
   }) {
     return i1.LocalAssetEntityCompanion(
       name: name ?? this.name,
@@ -1257,6 +1395,8 @@ class LocalAssetEntityCompanion
       latitude: latitude ?? this.latitude,
       longitude: longitude ?? this.longitude,
       playbackStyle: playbackStyle ?? this.playbackStyle,
+      priorRemoteId: priorRemoteId ?? this.priorRemoteId,
+      syncedChecksum: syncedChecksum ?? this.syncedChecksum,
     );
   }
 
@@ -1317,6 +1457,12 @@ class LocalAssetEntityCompanion
         ),
       );
     }
+    if (priorRemoteId.present) {
+      map['prior_remote_id'] = i0.Variable<String>(priorRemoteId.value);
+    }
+    if (syncedChecksum.present) {
+      map['synced_checksum'] = i0.Variable<String>(syncedChecksum.value);
+    }
     return map;
   }
 
@@ -1338,7 +1484,9 @@ class LocalAssetEntityCompanion
           ..write('adjustmentTime: $adjustmentTime, ')
           ..write('latitude: $latitude, ')
           ..write('longitude: $longitude, ')
-          ..write('playbackStyle: $playbackStyle')
+          ..write('playbackStyle: $playbackStyle, ')
+          ..write('priorRemoteId: $priorRemoteId, ')
+          ..write('syncedChecksum: $syncedChecksum')
           ..write(')'))
         .toString();
   }
@@ -1348,3 +1496,7 @@ i0.Index get idxLocalAssetCloudId => i0.Index(
   'idx_local_asset_cloud_id',
   'CREATE INDEX IF NOT EXISTS idx_local_asset_cloud_id ON local_asset_entity (i_cloud_id)',
 );
+i0.Index get idxLocalAssetPriorRemoteId => i0.Index(
+  'idx_local_asset_prior_remote_id',
+  'CREATE INDEX IF NOT EXISTS idx_local_asset_prior_remote_id ON local_asset_entity (prior_remote_id)',
+);

mobile/lib/infrastructure/entities/merged_asset.drift

@@ -7,7 +7,13 @@ import 'local_album_asset.entity.dart';
 mergedAsset:
 SELECT
 	rae.id as remote_id,
-	(SELECT lae.id FROM local_asset_entity lae WHERE lae.checksum = rae.checksum LIMIT 1) as local_id,
+	-- local_id links a remote to its on-device copy, normally by checksum. A reverted iOS
+	-- edit re-encodes to fresh bytes so the checksum no longer matches, but its
+	-- prior_remote_id still points at this remote, so fall back to that.
+	COALESCE(
+		(SELECT lae.id FROM local_asset_entity lae WHERE lae.checksum = rae.checksum LIMIT 1),
+		(SELECT lae.id FROM local_asset_entity lae WHERE lae.prior_remote_id = rae.id LIMIT 1)
+	) as local_id,
 	rae.name,
 	rae."type",
 	rae.created_at as created_at,
@@ -83,6 +89,13 @@ AND NOT EXISTS (
     INNER JOIN local_album_entity la on laa.album_id = la.id
     WHERE laa.asset_id = lae.id AND la.backup_selection = 2 -- excluded
 )
+-- iOS edit-in-progress / revert: if this local was already uploaded (its
+-- prior_remote_id resolves to a live remote), hide the local tile so the remote
+-- (the edit, or the flipped-back original) is the single source of truth. Kills
+-- the transient 2-tile flicker and stops a reverted local from re-appearing.
+AND NOT EXISTS (
+	SELECT 1 FROM remote_asset_entity rae WHERE rae.id = lae.prior_remote_id AND rae.owner_id IN :user_ids AND rae.deleted_at IS NULL
+)
 ORDER BY created_at DESC
 LIMIT $limit;
 
@@ -136,6 +149,10 @@ FROM
 		INNER JOIN local_album_entity la on laa.album_id = la.id
 		WHERE laa.asset_id = lae.id AND la.backup_selection = 2 -- excluded
 	)
+	-- iOS edit-in-progress / revert: hide a local already represented by a live remote.
+	AND NOT EXISTS (
+		SELECT 1 FROM remote_asset_entity rae WHERE rae.id = lae.prior_remote_id AND rae.owner_id IN :user_ids AND rae.deleted_at IS NULL
+	)
 )
 GROUP BY bucket_date
 ORDER BY bucket_date DESC;

mobile/lib/infrastructure/entities/merged_asset.drift.dart

@@ -29,7 +29,7 @@ class MergedAssetDrift extends i1.ModularAccessor {
     );
     $arrayStartIndex += generatedlimit.amountOfVariables;
     return customSelect(
-      'SELECT rae.id AS remote_id, (SELECT lae.id FROM local_asset_entity AS lae WHERE lae.checksum = rae.checksum LIMIT 1) AS local_id, rae.name, rae.type, rae.created_at AS created_at, rae.updated_at, rae.width, rae.height, rae.duration_ms, rae.is_favorite, rae.thumb_hash, rae.checksum, rae.owner_id, rae.live_photo_video_id, 0 AS orientation, rae.stack_id, NULL AS i_cloud_id, NULL AS latitude, NULL AS longitude, NULL AS adjustmentTime, rae.is_edited, 0 AS playback_style, rae.uploaded_at FROM remote_asset_entity AS rae LEFT JOIN stack_entity AS se ON rae.stack_id = se.id WHERE rae.deleted_at IS NULL AND rae.visibility = 0 AND rae.owner_id IN ($expandeduserIds) AND(rae.stack_id IS NULL OR rae.id = se.primary_asset_id)UNION ALL SELECT NULL AS remote_id, lae.id AS local_id, lae.name, lae.type, lae.created_at AS created_at, lae.updated_at, lae.width, lae.height, lae.duration_ms, lae.is_favorite, NULL AS thumb_hash, lae.checksum, NULL AS owner_id, NULL AS live_photo_video_id, lae.orientation, NULL AS stack_id, lae.i_cloud_id, lae.latitude, lae.longitude, lae.adjustment_time, 0 AS is_edited, lae.playback_style, NULL AS uploaded_at FROM local_asset_entity AS lae WHERE NOT EXISTS (SELECT 1 FROM remote_asset_entity AS rae WHERE rae.checksum = lae.checksum AND rae.owner_id IN ($expandeduserIds)) AND EXISTS (SELECT 1 FROM local_album_asset_entity AS laa INNER JOIN local_album_entity AS la ON laa.album_id = la.id WHERE laa.asset_id = lae.id AND la.backup_selection = 0) AND NOT EXISTS (SELECT 1 FROM local_album_asset_entity AS laa INNER JOIN local_album_entity AS la ON laa.album_id = la.id WHERE laa.asset_id = lae.id AND la.backup_selection = 2) ORDER BY created_at DESC ${generatedlimit.sql}',
+      'SELECT rae.id AS remote_id, COALESCE((SELECT lae.id FROM local_asset_entity AS lae WHERE lae.checksum = rae.checksum LIMIT 1), (SELECT lae.id FROM local_asset_entity AS lae WHERE lae.prior_remote_id = rae.id LIMIT 1)) AS local_id, rae.name, rae.type, rae.created_at AS created_at, rae.updated_at, rae.width, rae.height, rae.duration_ms, rae.is_favorite, rae.thumb_hash, rae.checksum, rae.owner_id, rae.live_photo_video_id, 0 AS orientation, rae.stack_id, NULL AS i_cloud_id, NULL AS latitude, NULL AS longitude, NULL AS adjustmentTime, rae.is_edited, 0 AS playback_style, rae.uploaded_at FROM remote_asset_entity AS rae LEFT JOIN stack_entity AS se ON rae.stack_id = se.id WHERE rae.deleted_at IS NULL AND rae.visibility = 0 AND rae.owner_id IN ($expandeduserIds) AND(rae.stack_id IS NULL OR rae.id = se.primary_asset_id)UNION ALL SELECT NULL AS remote_id, lae.id AS local_id, lae.name, lae.type, lae.created_at AS created_at, lae.updated_at, lae.width, lae.height, lae.duration_ms, lae.is_favorite, NULL AS thumb_hash, lae.checksum, NULL AS owner_id, NULL AS live_photo_video_id, lae.orientation, NULL AS stack_id, lae.i_cloud_id, lae.latitude, lae.longitude, lae.adjustment_time, 0 AS is_edited, lae.playback_style, NULL AS uploaded_at FROM local_asset_entity AS lae WHERE NOT EXISTS (SELECT 1 FROM remote_asset_entity AS rae WHERE rae.checksum = lae.checksum AND rae.owner_id IN ($expandeduserIds)) AND EXISTS (SELECT 1 FROM local_album_asset_entity AS laa INNER JOIN local_album_entity AS la ON laa.album_id = la.id WHERE laa.asset_id = lae.id AND la.backup_selection = 0) AND NOT EXISTS (SELECT 1 FROM local_album_asset_entity AS laa INNER JOIN local_album_entity AS la ON laa.album_id = la.id WHERE laa.asset_id = lae.id AND la.backup_selection = 2) AND NOT EXISTS (SELECT 1 FROM remote_asset_entity AS rae WHERE rae.id = lae.prior_remote_id AND rae.owner_id IN ($expandeduserIds) AND rae.deleted_at IS NULL) ORDER BY created_at DESC ${generatedlimit.sql}',
       variables: [
         for (var $ in userIds) i0.Variable<String>($),
         ...generatedlimit.introducedVariables,
@@ -81,7 +81,7 @@ class MergedAssetDrift extends i1.ModularAccessor {
     final expandeduserIds = $expandVar($arrayStartIndex, userIds.length);
     $arrayStartIndex += userIds.length;
     return customSelect(
-      'SELECT COUNT(*) AS asset_count, bucket_date FROM (SELECT CASE WHEN ?1 = 0 THEN COALESCE(STRFTIME(\'%Y-%m-%d\', rae.local_date_time), STRFTIME(\'%Y-%m-%d\', rae.created_at, \'localtime\')) WHEN ?1 = 1 THEN COALESCE(STRFTIME(\'%Y-%m\', rae.local_date_time), STRFTIME(\'%Y-%m\', rae.created_at, \'localtime\')) END AS bucket_date FROM remote_asset_entity AS rae LEFT JOIN stack_entity AS se ON rae.stack_id = se.id WHERE rae.deleted_at IS NULL AND rae.visibility = 0 AND rae.owner_id IN ($expandeduserIds) AND(rae.stack_id IS NULL OR rae.id = se.primary_asset_id)UNION ALL SELECT CASE WHEN ?1 = 0 THEN STRFTIME(\'%Y-%m-%d\', lae.created_at, \'localtime\') WHEN ?1 = 1 THEN STRFTIME(\'%Y-%m\', lae.created_at, \'localtime\') END AS bucket_date FROM local_asset_entity AS lae WHERE NOT EXISTS (SELECT 1 FROM remote_asset_entity AS rae WHERE rae.checksum = lae.checksum AND rae.owner_id IN ($expandeduserIds)) AND EXISTS (SELECT 1 FROM local_album_asset_entity AS laa INNER JOIN local_album_entity AS la ON laa.album_id = la.id WHERE laa.asset_id = lae.id AND la.backup_selection = 0) AND NOT EXISTS (SELECT 1 FROM local_album_asset_entity AS laa INNER JOIN local_album_entity AS la ON laa.album_id = la.id WHERE laa.asset_id = lae.id AND la.backup_selection = 2)) GROUP BY bucket_date ORDER BY bucket_date DESC',
+      'SELECT COUNT(*) AS asset_count, bucket_date FROM (SELECT CASE WHEN ?1 = 0 THEN COALESCE(STRFTIME(\'%Y-%m-%d\', rae.local_date_time), STRFTIME(\'%Y-%m-%d\', rae.created_at, \'localtime\')) WHEN ?1 = 1 THEN COALESCE(STRFTIME(\'%Y-%m\', rae.local_date_time), STRFTIME(\'%Y-%m\', rae.created_at, \'localtime\')) END AS bucket_date FROM remote_asset_entity AS rae LEFT JOIN stack_entity AS se ON rae.stack_id = se.id WHERE rae.deleted_at IS NULL AND rae.visibility = 0 AND rae.owner_id IN ($expandeduserIds) AND(rae.stack_id IS NULL OR rae.id = se.primary_asset_id)UNION ALL SELECT CASE WHEN ?1 = 0 THEN STRFTIME(\'%Y-%m-%d\', lae.created_at, \'localtime\') WHEN ?1 = 1 THEN STRFTIME(\'%Y-%m\', lae.created_at, \'localtime\') END AS bucket_date FROM local_asset_entity AS lae WHERE NOT EXISTS (SELECT 1 FROM remote_asset_entity AS rae WHERE rae.checksum = lae.checksum AND rae.owner_id IN ($expandeduserIds)) AND EXISTS (SELECT 1 FROM local_album_asset_entity AS laa INNER JOIN local_album_entity AS la ON laa.album_id = la.id WHERE laa.asset_id = lae.id AND la.backup_selection = 0) AND NOT EXISTS (SELECT 1 FROM local_album_asset_entity AS laa INNER JOIN local_album_entity AS la ON laa.album_id = la.id WHERE laa.asset_id = lae.id AND la.backup_selection = 2) AND NOT EXISTS (SELECT 1 FROM remote_asset_entity AS rae WHERE rae.id = lae.prior_remote_id AND rae.owner_id IN ($expandeduserIds) AND rae.deleted_at IS NULL)) GROUP BY bucket_date ORDER BY bucket_date DESC',
       variables: [
         i0.Variable<int>(groupBy),
         for (var $ in userIds) i0.Variable<String>($),

mobile/lib/infrastructure/repositories/backup.repository.dart

@@ -58,7 +58,8 @@ class DriftBackupRepository extends DriftDatabaseRepository {
             INNER JOIN main.local_album_entity la on laa.album_id = la.id
             WHERE laa.asset_id = lae.id
                 AND la.backup_selection = ?3
-        );
+        )
+        AND (lae.synced_checksum IS NULL OR lae.synced_checksum != lae.checksum);
       ''';
 
     final row = await _db
@@ -104,6 +105,10 @@ class DriftBackupRepository extends DriftDatabaseRepository {
                   _db.remoteAssetEntity.checksum.equalsExp(lae.checksum) & _db.remoteAssetEntity.ownerId.equals(userId),
                 ),
             ) &
+            // iOS revert: a reverted local hashes fresh (matches nothing remote),
+            // but if it was already reconciled (syncedChecksum == current checksum)
+            // it's handled, so don't re-queue it as a fresh upload.
+            (lae.syncedChecksum.isNull() | lae.syncedChecksum.equalsExp(lae.checksum).not()) &
             lae.id.isNotInQuery(_getExcludedSubquery()),
       )
       ..orderBy([(localAsset) => OrderingTerm.desc(localAsset.createdAt)]);

mobile/lib/infrastructure/repositories/db.repository.dart

@@ -98,7 +98,7 @@ class Drift extends $Drift {
   }
 
   @override
-  int get schemaVersion => 26;
+  int get schemaVersion => 27;
 
   @override
   MigrationStrategy get migration => MigrationStrategy(
@@ -276,6 +276,11 @@ class Drift extends $Drift {
           from25To26: (m, v26) async {
             await m.addColumn(v26.remoteAssetEntity, v26.remoteAssetEntity.uploadedAt);
           },
+          from26To27: (m, v27) async {
+            await m.addColumn(v27.localAssetEntity, v27.localAssetEntity.priorRemoteId);
+            await m.addColumn(v27.localAssetEntity, v27.localAssetEntity.syncedChecksum);
+            await m.createIndex(v27.idxLocalAssetPriorRemoteId);
+          },
         ),
       );
 

mobile/lib/infrastructure/repositories/db.repository.drift.dart

@@ -112,6 +112,7 @@ abstract class $Drift extends i0.GeneratedDatabase {
     i7.idxLocalAlbumAssetAlbumAsset,
     i4.idxLocalAssetChecksum,
     i4.idxLocalAssetCloudId,
+    i4.idxLocalAssetPriorRemoteId,
     i3.idxStackPrimaryAssetId,
     i2.uQRemoteAssetsOwnerChecksum,
     i2.uQRemoteAssetsOwnerLibraryChecksum,

mobile/lib/infrastructure/repositories/db.repository.steps.dart

@@ -13539,6 +13539,613 @@ i1.GeneratedColumn<String> _column_212(String aliasedName) =>
       type: i1.DriftSqlType.string,
       $customConstraints: 'NULL',
     );
+
+final class Schema27 extends i0.VersionedSchema {
+  Schema27({required super.database}) : super(version: 27);
+  @override
+  late final List<i1.DatabaseSchemaEntity> entities = [
+    userEntity,
+    remoteAssetEntity,
+    stackEntity,
+    localAssetEntity,
+    remoteAlbumEntity,
+    localAlbumEntity,
+    localAlbumAssetEntity,
+    idxLocalAlbumAssetAlbumAsset,
+    idxLocalAssetChecksum,
+    idxLocalAssetCloudId,
+    idxLocalAssetPriorRemoteId,
+    idxStackPrimaryAssetId,
+    uQRemoteAssetsOwnerChecksum,
+    uQRemoteAssetsOwnerLibraryChecksum,
+    idxRemoteAssetChecksum,
+    idxRemoteAssetStackId,
+    idxRemoteAssetOwnerVisibilityDeletedCreated,
+    authUserEntity,
+    userMetadataEntity,
+    partnerEntity,
+    remoteExifEntity,
+    remoteAlbumAssetEntity,
+    remoteAlbumUserEntity,
+    remoteAssetCloudIdEntity,
+    memoryEntity,
+    memoryAssetEntity,
+    personEntity,
+    assetFaceEntity,
+    storeEntity,
+    trashedLocalAssetEntity,
+    assetEditEntity,
+    metadata,
+    idxPartnerSharedWithId,
+    idxLatLng,
+    idxRemoteExifCity,
+    idxRemoteAlbumAssetAlbumAsset,
+    idxRemoteAssetCloudId,
+    idxPersonOwnerId,
+    idxAssetFacePersonId,
+    idxAssetFaceAssetId,
+    idxAssetFaceVisiblePerson,
+    idxTrashedLocalAssetChecksum,
+    idxTrashedLocalAssetAlbum,
+    idxAssetEditAssetId,
+  ];
+  late final Shape33 userEntity = Shape33(
+    source: i0.VersionedTable(
+      entityName: 'user_entity',
+      withoutRowId: true,
+      isStrict: true,
+      tableConstraints: ['PRIMARY KEY(id)'],
+      columns: [
+        _column_107,
+        _column_108,
+        _column_109,
+        _column_110,
+        _column_111,
+        _column_112,
+      ],
+      attachedDatabase: database,
+    ),
+    alias: null,
+  );
+  late final Shape50 remoteAssetEntity = Shape50(
+    source: i0.VersionedTable(
+      entityName: 'remote_asset_entity',
+      withoutRowId: true,
+      isStrict: true,
+      tableConstraints: ['PRIMARY KEY(id)'],
+      columns: [
+        _column_108,
+        _column_113,
+        _column_114,
+        _column_115,
+        _column_116,
+        _column_117,
+        _column_118,
+        _column_107,
+        _column_119,
+        _column_120,
+        _column_121,
+        _column_122,
+        _column_123,
+        _column_124,
+        _column_212,
+        _column_125,
+        _column_126,
+        _column_127,
+        _column_128,
+        _column_129,
+      ],
+      attachedDatabase: database,
+    ),
+    alias: null,
+  );
+  late final Shape35 stackEntity = Shape35(
+    source: i0.VersionedTable(
+      entityName: 'stack_entity',
+      withoutRowId: true,
+      isStrict: true,
+      tableConstraints: ['PRIMARY KEY(id)'],
+      columns: [
+        _column_107,
+        _column_114,
+        _column_115,
+        _column_121,
+        _column_130,
+      ],
+      attachedDatabase: database,
+    ),
+    alias: null,
+  );
+  late final Shape51 localAssetEntity = Shape51(
+    source: i0.VersionedTable(
+      entityName: 'local_asset_entity',
+      withoutRowId: true,
+      isStrict: true,
+      tableConstraints: ['PRIMARY KEY(id)'],
+      columns: [
+        _column_108,
+        _column_113,
+        _column_114,
+        _column_115,
+        _column_116,
+        _column_117,
+        _column_118,
+        _column_107,
+        _column_131,
+        _column_120,
+        _column_132,
+        _column_133,
+        _column_134,
+        _column_135,
+        _column_136,
+        _column_137,
+        _column_213,
+        _column_214,
+      ],
+      attachedDatabase: database,
+    ),
+    alias: null,
+  );
+  late final Shape48 remoteAlbumEntity = Shape48(
+    source: i0.VersionedTable(
+      entityName: 'remote_album_entity',
+      withoutRowId: true,
+      isStrict: true,
+      tableConstraints: ['PRIMARY KEY(id)'],
+      columns: [
+        _column_107,
+        _column_108,
+        _column_138,
+        _column_114,
+        _column_115,
+        _column_139,
+        _column_140,
+        _column_141,
+      ],
+      attachedDatabase: database,
+    ),
+    alias: null,
+  );
+  late final Shape38 localAlbumEntity = Shape38(
+    source: i0.VersionedTable(
+      entityName: 'local_album_entity',
+      withoutRowId: true,
+      isStrict: true,
+      tableConstraints: ['PRIMARY KEY(id)'],
+      columns: [
+        _column_107,
+        _column_108,
+        _column_115,
+        _column_142,
+        _column_143,
+        _column_144,
+        _column_145,
+      ],
+      attachedDatabase: database,
+    ),
+    alias: null,
+  );
+  late final Shape39 localAlbumAssetEntity = Shape39(
+    source: i0.VersionedTable(
+      entityName: 'local_album_asset_entity',
+      withoutRowId: true,
+      isStrict: true,
+      tableConstraints: ['PRIMARY KEY(asset_id, album_id)'],
+      columns: [_column_146, _column_147, _column_145],
+      attachedDatabase: database,
+    ),
+    alias: null,
+  );
+  final i1.Index idxLocalAlbumAssetAlbumAsset = i1.Index(
+    'idx_local_album_asset_album_asset',
+    'CREATE INDEX IF NOT EXISTS idx_local_album_asset_album_asset ON local_album_asset_entity (album_id, asset_id)',
+  );
+  final i1.Index idxLocalAssetChecksum = i1.Index(
+    'idx_local_asset_checksum',
+    'CREATE INDEX IF NOT EXISTS idx_local_asset_checksum ON local_asset_entity (checksum)',
+  );
+  final i1.Index idxLocalAssetCloudId = i1.Index(
+    'idx_local_asset_cloud_id',
+    'CREATE INDEX IF NOT EXISTS idx_local_asset_cloud_id ON local_asset_entity (i_cloud_id)',
+  );
+  final i1.Index idxLocalAssetPriorRemoteId = i1.Index(
+    'idx_local_asset_prior_remote_id',
+    'CREATE INDEX IF NOT EXISTS idx_local_asset_prior_remote_id ON local_asset_entity (prior_remote_id)',
+  );
+  final i1.Index idxStackPrimaryAssetId = i1.Index(
+    'idx_stack_primary_asset_id',
+    'CREATE INDEX IF NOT EXISTS idx_stack_primary_asset_id ON stack_entity (primary_asset_id)',
+  );
+  final i1.Index uQRemoteAssetsOwnerChecksum = i1.Index(
+    'UQ_remote_assets_owner_checksum',
+    'CREATE UNIQUE INDEX IF NOT EXISTS UQ_remote_assets_owner_checksum ON remote_asset_entity (owner_id, checksum) WHERE(library_id IS NULL)',
+  );
+  final i1.Index uQRemoteAssetsOwnerLibraryChecksum = i1.Index(
+    'UQ_remote_assets_owner_library_checksum',
+    'CREATE UNIQUE INDEX IF NOT EXISTS UQ_remote_assets_owner_library_checksum ON remote_asset_entity (owner_id, library_id, checksum) WHERE(library_id IS NOT NULL)',
+  );
+  final i1.Index idxRemoteAssetChecksum = i1.Index(
+    'idx_remote_asset_checksum',
+    'CREATE INDEX IF NOT EXISTS idx_remote_asset_checksum ON remote_asset_entity (checksum)',
+  );
+  final i1.Index idxRemoteAssetStackId = i1.Index(
+    'idx_remote_asset_stack_id',
+    'CREATE INDEX IF NOT EXISTS idx_remote_asset_stack_id ON remote_asset_entity (stack_id)',
+  );
+  final i1.Index idxRemoteAssetOwnerVisibilityDeletedCreated = i1.Index(
+    'idx_remote_asset_owner_visibility_deleted_created',
+    'CREATE INDEX IF NOT EXISTS idx_remote_asset_owner_visibility_deleted_created ON remote_asset_entity (owner_id, visibility, deleted_at, created_at DESC)',
+  );
+  late final Shape40 authUserEntity = Shape40(
+    source: i0.VersionedTable(
+      entityName: 'auth_user_entity',
+      withoutRowId: true,
+      isStrict: true,
+      tableConstraints: ['PRIMARY KEY(id)'],
+      columns: [
+        _column_107,
+        _column_108,
+        _column_109,
+        _column_148,
+        _column_110,
+        _column_111,
+        _column_149,
+        _column_150,
+        _column_151,
+        _column_152,
+      ],
+      attachedDatabase: database,
+    ),
+    alias: null,
+  );
+  late final Shape4 userMetadataEntity = Shape4(
+    source: i0.VersionedTable(
+      entityName: 'user_metadata_entity',
+      withoutRowId: true,
+      isStrict: true,
+      tableConstraints: ['PRIMARY KEY(user_id, "key")'],
+      columns: [_column_153, _column_154, _column_155],
+      attachedDatabase: database,
+    ),
+    alias: null,
+  );
+  late final Shape41 partnerEntity = Shape41(
+    source: i0.VersionedTable(
+      entityName: 'partner_entity',
+      withoutRowId: true,
+      isStrict: true,
+      tableConstraints: ['PRIMARY KEY(shared_by_id, shared_with_id)'],
+      columns: [_column_156, _column_157, _column_158],
+      attachedDatabase: database,
+    ),
+    alias: null,
+  );
+  late final Shape42 remoteExifEntity = Shape42(
+    source: i0.VersionedTable(
+      entityName: 'remote_exif_entity',
+      withoutRowId: true,
+      isStrict: true,
+      tableConstraints: ['PRIMARY KEY(asset_id)'],
+      columns: [
+        _column_159,
+        _column_160,
+        _column_161,
+        _column_162,
+        _column_163,
+        _column_164,
+        _column_117,
+        _column_116,
+        _column_165,
+        _column_166,
+        _column_167,
+        _column_168,
+        _column_135,
+        _column_136,
+        _column_169,
+        _column_170,
+        _column_171,
+        _column_172,
+        _column_173,
+        _column_174,
+        _column_175,
+        _column_176,
+      ],
+      attachedDatabase: database,
+    ),
+    alias: null,
+  );
+  late final Shape7 remoteAlbumAssetEntity = Shape7(
+    source: i0.VersionedTable(
+      entityName: 'remote_album_asset_entity',
+      withoutRowId: true,
+      isStrict: true,
+      tableConstraints: ['PRIMARY KEY(asset_id, album_id)'],
+      columns: [_column_159, _column_177],
+      attachedDatabase: database,
+    ),
+    alias: null,
+  );
+  late final Shape10 remoteAlbumUserEntity = Shape10(
+    source: i0.VersionedTable(
+      entityName: 'remote_album_user_entity',
+      withoutRowId: true,
+      isStrict: true,
+      tableConstraints: ['PRIMARY KEY(album_id, user_id)'],
+      columns: [_column_177, _column_153, _column_178],
+      attachedDatabase: database,
+    ),
+    alias: null,
+  );
+  late final Shape43 remoteAssetCloudIdEntity = Shape43(
+    source: i0.VersionedTable(
+      entityName: 'remote_asset_cloud_id_entity',
+      withoutRowId: true,
+      isStrict: true,
+      tableConstraints: ['PRIMARY KEY(asset_id)'],
+      columns: [
+        _column_159,
+        _column_179,
+        _column_180,
+        _column_134,
+        _column_135,
+        _column_136,
+      ],
+      attachedDatabase: database,
+    ),
+    alias: null,
+  );
+  late final Shape44 memoryEntity = Shape44(
+    source: i0.VersionedTable(
+      entityName: 'memory_entity',
+      withoutRowId: true,
+      isStrict: true,
+      tableConstraints: ['PRIMARY KEY(id)'],
+      columns: [
+        _column_107,
+        _column_114,
+        _column_115,
+        _column_124,
+        _column_121,
+        _column_113,
+        _column_181,
+        _column_182,
+        _column_183,
+        _column_184,
+        _column_185,
+        _column_186,
+      ],
+      attachedDatabase: database,
+    ),
+    alias: null,
+  );
+  late final Shape12 memoryAssetEntity = Shape12(
+    source: i0.VersionedTable(
+      entityName: 'memory_asset_entity',
+      withoutRowId: true,
+      isStrict: true,
+      tableConstraints: ['PRIMARY KEY(asset_id, memory_id)'],
+      columns: [_column_159, _column_187],
+      attachedDatabase: database,
+    ),
+    alias: null,
+  );
+  late final Shape45 personEntity = Shape45(
+    source: i0.VersionedTable(
+      entityName: 'person_entity',
+      withoutRowId: true,
+      isStrict: true,
+      tableConstraints: ['PRIMARY KEY(id)'],
+      columns: [
+        _column_107,
+        _column_114,
+        _column_115,
+        _column_121,
+        _column_108,
+        _column_188,
+        _column_189,
+        _column_190,
+        _column_191,
+        _column_192,
+      ],
+      attachedDatabase: database,
+    ),
+    alias: null,
+  );
+  late final Shape46 assetFaceEntity = Shape46(
+    source: i0.VersionedTable(
+      entityName: 'asset_face_entity',
+      withoutRowId: true,
+      isStrict: true,
+      tableConstraints: ['PRIMARY KEY(id)'],
+      columns: [
+        _column_107,
+        _column_159,
+        _column_193,
+        _column_194,
+        _column_195,
+        _column_196,
+        _column_197,
+        _column_198,
+        _column_199,
+        _column_200,
+        _column_201,
+        _column_124,
+      ],
+      attachedDatabase: database,
+    ),
+    alias: null,
+  );
+  late final Shape18 storeEntity = Shape18(
+    source: i0.VersionedTable(
+      entityName: 'store_entity',
+      withoutRowId: true,
+      isStrict: true,
+      tableConstraints: ['PRIMARY KEY(id)'],
+      columns: [_column_202, _column_203, _column_204],
+      attachedDatabase: database,
+    ),
+    alias: null,
+  );
+  late final Shape47 trashedLocalAssetEntity = Shape47(
+    source: i0.VersionedTable(
+      entityName: 'trashed_local_asset_entity',
+      withoutRowId: true,
+      isStrict: true,
+      tableConstraints: ['PRIMARY KEY(id, album_id)'],
+      columns: [
+        _column_108,
+        _column_113,
+        _column_114,
+        _column_115,
+        _column_116,
+        _column_117,
+        _column_118,
+        _column_107,
+        _column_205,
+        _column_131,
+        _column_120,
+        _column_132,
+        _column_206,
+        _column_137,
+      ],
+      attachedDatabase: database,
+    ),
+    alias: null,
+  );
+  late final Shape32 assetEditEntity = Shape32(
+    source: i0.VersionedTable(
+      entityName: 'asset_edit_entity',
+      withoutRowId: true,
+      isStrict: true,
+      tableConstraints: ['PRIMARY KEY(id)'],
+      columns: [
+        _column_107,
+        _column_159,
+        _column_207,
+        _column_208,
+        _column_209,
+      ],
+      attachedDatabase: database,
+    ),
+    alias: null,
+  );
+  late final Shape49 metadata = Shape49(
+    source: i0.VersionedTable(
+      entityName: 'metadata',
+      withoutRowId: true,
+      isStrict: true,
+      tableConstraints: ['PRIMARY KEY("key")'],
+      columns: [_column_210, _column_211, _column_115],
+      attachedDatabase: database,
+    ),
+    alias: null,
+  );
+  final i1.Index idxPartnerSharedWithId = i1.Index(
+    'idx_partner_shared_with_id',
+    'CREATE INDEX IF NOT EXISTS idx_partner_shared_with_id ON partner_entity (shared_with_id)',
+  );
+  final i1.Index idxLatLng = i1.Index(
+    'idx_lat_lng',
+    'CREATE INDEX IF NOT EXISTS idx_lat_lng ON remote_exif_entity (latitude, longitude)',
+  );
+  final i1.Index idxRemoteExifCity = i1.Index(
+    'idx_remote_exif_city',
+    'CREATE INDEX IF NOT EXISTS idx_remote_exif_city ON remote_exif_entity (city) WHERE city IS NOT NULL',
+  );
+  final i1.Index idxRemoteAlbumAssetAlbumAsset = i1.Index(
+    'idx_remote_album_asset_album_asset',
+    'CREATE INDEX IF NOT EXISTS idx_remote_album_asset_album_asset ON remote_album_asset_entity (album_id, asset_id)',
+  );
+  final i1.Index idxRemoteAssetCloudId = i1.Index(
+    'idx_remote_asset_cloud_id',
+    'CREATE INDEX IF NOT EXISTS idx_remote_asset_cloud_id ON remote_asset_cloud_id_entity (cloud_id)',
+  );
+  final i1.Index idxPersonOwnerId = i1.Index(
+    'idx_person_owner_id',
+    'CREATE INDEX IF NOT EXISTS idx_person_owner_id ON person_entity (owner_id)',
+  );
+  final i1.Index idxAssetFacePersonId = i1.Index(
+    'idx_asset_face_person_id',
+    'CREATE INDEX IF NOT EXISTS idx_asset_face_person_id ON asset_face_entity (person_id)',
+  );
+  final i1.Index idxAssetFaceAssetId = i1.Index(
+    'idx_asset_face_asset_id',
+    'CREATE INDEX IF NOT EXISTS idx_asset_face_asset_id ON asset_face_entity (asset_id)',
+  );
+  final i1.Index idxAssetFaceVisiblePerson = i1.Index(
+    'idx_asset_face_visible_person',
+    'CREATE INDEX IF NOT EXISTS idx_asset_face_visible_person ON asset_face_entity (person_id, asset_id) WHERE is_visible = 1 AND deleted_at IS NULL',
+  );
+  final i1.Index idxTrashedLocalAssetChecksum = i1.Index(
+    'idx_trashed_local_asset_checksum',
+    'CREATE INDEX IF NOT EXISTS idx_trashed_local_asset_checksum ON trashed_local_asset_entity (checksum)',
+  );
+  final i1.Index idxTrashedLocalAssetAlbum = i1.Index(
+    'idx_trashed_local_asset_album',
+    'CREATE INDEX IF NOT EXISTS idx_trashed_local_asset_album ON trashed_local_asset_entity (album_id)',
+  );
+  final i1.Index idxAssetEditAssetId = i1.Index(
+    'idx_asset_edit_asset_id',
+    'CREATE INDEX IF NOT EXISTS idx_asset_edit_asset_id ON asset_edit_entity (asset_id)',
+  );
+}
+
+class Shape51 extends i0.VersionedTable {
+  Shape51({required super.source, required super.alias}) : super.aliased();
+  i1.GeneratedColumn<String> get name =>
+      columnsByName['name']! as i1.GeneratedColumn<String>;
+  i1.GeneratedColumn<int> get type =>
+      columnsByName['type']! as i1.GeneratedColumn<int>;
+  i1.GeneratedColumn<String> get createdAt =>
+      columnsByName['created_at']! as i1.GeneratedColumn<String>;
+  i1.GeneratedColumn<String> get updatedAt =>
+      columnsByName['updated_at']! as i1.GeneratedColumn<String>;
+  i1.GeneratedColumn<int> get width =>
+      columnsByName['width']! as i1.GeneratedColumn<int>;
+  i1.GeneratedColumn<int> get height =>
+      columnsByName['height']! as i1.GeneratedColumn<int>;
+  i1.GeneratedColumn<int> get durationMs =>
+      columnsByName['duration_ms']! as i1.GeneratedColumn<int>;
+  i1.GeneratedColumn<String> get id =>
+      columnsByName['id']! as i1.GeneratedColumn<String>;
+  i1.GeneratedColumn<String> get checksum =>
+      columnsByName['checksum']! as i1.GeneratedColumn<String>;
+  i1.GeneratedColumn<int> get isFavorite =>
+      columnsByName['is_favorite']! as i1.GeneratedColumn<int>;
+  i1.GeneratedColumn<int> get orientation =>
+      columnsByName['orientation']! as i1.GeneratedColumn<int>;
+  i1.GeneratedColumn<String> get iCloudId =>
+      columnsByName['i_cloud_id']! as i1.GeneratedColumn<String>;
+  i1.GeneratedColumn<String> get adjustmentTime =>
+      columnsByName['adjustment_time']! as i1.GeneratedColumn<String>;
+  i1.GeneratedColumn<double> get latitude =>
+      columnsByName['latitude']! as i1.GeneratedColumn<double>;
+  i1.GeneratedColumn<double> get longitude =>
+      columnsByName['longitude']! as i1.GeneratedColumn<double>;
+  i1.GeneratedColumn<int> get playbackStyle =>
+      columnsByName['playback_style']! as i1.GeneratedColumn<int>;
+  i1.GeneratedColumn<String> get priorRemoteId =>
+      columnsByName['prior_remote_id']! as i1.GeneratedColumn<String>;
+  i1.GeneratedColumn<String> get syncedChecksum =>
+      columnsByName['synced_checksum']! as i1.GeneratedColumn<String>;
+}
+
+i1.GeneratedColumn<String> _column_213(String aliasedName) =>
+    i1.GeneratedColumn<String>(
+      'prior_remote_id',
+      aliasedName,
+      true,
+      type: i1.DriftSqlType.string,
+      $customConstraints: 'NULL',
+    );
+i1.GeneratedColumn<String> _column_214(String aliasedName) =>
+    i1.GeneratedColumn<String>(
+      'synced_checksum',
+      aliasedName,
+      true,
+      type: i1.DriftSqlType.string,
+      $customConstraints: 'NULL',
+    );
 i0.MigrationStepWithVersion migrationSteps({
   required Future<void> Function(i1.Migrator m, Schema2 schema) from1To2,
   required Future<void> Function(i1.Migrator m, Schema3 schema) from2To3,
@@ -13565,6 +14172,7 @@ i0.MigrationStepWithVersion migrationSteps({
   required Future<void> Function(i1.Migrator m, Schema24 schema) from23To24,
   required Future<void> Function(i1.Migrator m, Schema25 schema) from24To25,
   required Future<void> Function(i1.Migrator m, Schema26 schema) from25To26,
+  required Future<void> Function(i1.Migrator m, Schema27 schema) from26To27,
 }) {
   return (currentVersion, database) async {
     switch (currentVersion) {
@@ -13693,6 +14301,11 @@ i0.MigrationStepWithVersion migrationSteps({
         final migrator = i1.Migrator(database, schema);
         await from25To26(migrator, schema);
         return 26;
+      case 26:
+        final schema = Schema27(database: database);
+        final migrator = i1.Migrator(database, schema);
+        await from26To27(migrator, schema);
+        return 27;
       default:
         throw ArgumentError.value('Unknown migration from $currentVersion');
     }
@@ -13725,6 +14338,7 @@ i1.OnUpgrade stepByStep({
   required Future<void> Function(i1.Migrator m, Schema24 schema) from23To24,
   required Future<void> Function(i1.Migrator m, Schema25 schema) from24To25,
   required Future<void> Function(i1.Migrator m, Schema26 schema) from25To26,
+  required Future<void> Function(i1.Migrator m, Schema27 schema) from26To27,
 }) => i0.VersionedSchema.stepByStepHelper(
   step: migrationSteps(
     from1To2: from1To2,
@@ -13752,5 +14366,6 @@ i1.OnUpgrade stepByStep({
     from23To24: from23To24,
     from24To25: from24To25,
     from25To26: from25To26,
+    from26To27: from26To27,
   ),
 );

mobile/lib/infrastructure/repositories/local_asset.repository.dart

@@ -64,6 +64,12 @@ class DriftLocalAssetRepository extends DriftDatabaseRepository {
     });
   }
 
+  Future<void> markSynced(String localId, {required String priorRemoteId, required String syncedChecksum}) {
+    return (_db.localAssetEntity.update()..where((e) => e.id.equals(localId))).write(
+      LocalAssetEntityCompanion(priorRemoteId: Value(priorRemoteId), syncedChecksum: Value(syncedChecksum)),
+    );
+  }
+
   Future<void> delete(List<String> ids) {
     if (ids.isEmpty) {
       return Future.value();

mobile/lib/infrastructure/repositories/stack.repository.dart

@@ -1,8 +1,24 @@
+import 'package:collection/collection.dart';
 import 'package:drift/drift.dart';
+import 'package:immich_mobile/constants/constants.dart';
 import 'package:immich_mobile/domain/models/stack.model.dart';
 import 'package:immich_mobile/infrastructure/entities/stack.entity.drift.dart';
 import 'package:immich_mobile/infrastructure/repositories/db.repository.dart';
 
+class StackReconcileTarget {
+  final String stackId;
+  final String newPrimaryId;
+  final String localAssetId;
+  final String localAssetChecksum;
+
+  const StackReconcileTarget({
+    required this.stackId,
+    required this.newPrimaryId,
+    required this.localAssetId,
+    required this.localAssetChecksum,
+  });
+}
+
 class DriftStackRepository extends DriftDatabaseRepository {
   final Drift _db;
   const DriftStackRepository(this._db) : super(_db);
@@ -14,6 +30,95 @@ class DriftStackRepository extends DriftDatabaseRepository {
       return stack.toDto();
     }).get();
   }
+
+  // Per local id, find a stack member whose checksum matches the local's current
+  // checksum but isn't the stack primary. That's the revert case: the local hashed
+  // back to the base while the primary still points at the edit.
+  Future<List<StackReconcileTarget>> findRevertReconcileTargets(Iterable<String> localAssetIds) async {
+    final ids = localAssetIds.toSet();
+    if (ids.isEmpty) {
+      return const [];
+    }
+
+    final targets = <StackReconcileTarget>[];
+    for (final slice in ids.slices(kDriftMaxChunk)) {
+      final placeholders = List.filled(slice.length, '?').join(',');
+      final rows = await _db
+          .customSelect(
+            '''
+        SELECT
+          s.id AS stack_id,
+          member.id AS new_primary,
+          local.id AS local_id,
+          local.checksum AS local_checksum
+        FROM local_asset_entity local
+        INNER JOIN remote_asset_entity prior ON prior.id = local.prior_remote_id AND prior.deleted_at IS NULL
+        INNER JOIN stack_entity s ON s.id = prior.stack_id
+        INNER JOIN remote_asset_entity member
+          ON member.stack_id = s.id
+          AND member.checksum = local.checksum
+          AND member.deleted_at IS NULL
+        WHERE local.id IN ($placeholders)
+          AND s.primary_asset_id != member.id
+        ''',
+            variables: slice.map((id) => Variable<String>(id)).toList(),
+            readsFrom: {_db.localAssetEntity, _db.remoteAssetEntity, _db.stackEntity},
+          )
+          .get();
+
+      for (final row in rows) {
+        targets.add(
+          StackReconcileTarget(
+            stackId: row.read<String>('stack_id'),
+            newPrimaryId: row.read<String>('new_primary'),
+            localAssetId: row.read<String>('local_id'),
+            localAssetChecksum: row.read<String>('local_checksum'),
+          ),
+        );
+      }
+    }
+    return targets;
+  }
+
+  // The stack a remote asset belongs to, if any. Used by the revert path to find
+  // the stack from prior_remote_id when the reverted bytes can't be checksum-matched.
+  Future<String?> findStackIdByRemoteId(String remoteId) async {
+    final row = await _db
+        .customSelect(
+          'SELECT stack_id FROM remote_asset_entity WHERE id = ? AND stack_id IS NOT NULL AND deleted_at IS NULL',
+          variables: [Variable<String>(remoteId)],
+          readsFrom: {_db.remoteAssetEntity},
+        )
+        .getSingleOrNull();
+    return row?.read<String?>('stack_id');
+  }
+
+  // The stack's original base member to flip back to on revert: the earliest-
+  // uploaded member that isn't the (latest-edit) prior. The base is uploaded
+  // before its edits, so oldest uploaded_at = the original.
+  Future<String?> findStackBaseId(String stackId, {required String excludeId}) async {
+    final row = await _db
+        .customSelect(
+          '''
+          SELECT id FROM remote_asset_entity
+          WHERE stack_id = ? AND id != ? AND deleted_at IS NULL
+          ORDER BY uploaded_at IS NULL, uploaded_at ASC, id ASC
+          LIMIT 1
+          ''',
+          variables: [Variable<String>(stackId), Variable<String>(excludeId)],
+          readsFrom: {_db.remoteAssetEntity},
+        )
+        .getSingleOrNull();
+    return row?.read<String?>('id');
+  }
+
+  // Optimistic local primary flip so the timeline updates immediately; the
+  // server's stack-update websocket rewrites it shortly after.
+  Future<void> setPrimary(String stackId, String primaryAssetId) {
+    return (_db.stackEntity.update()..where((e) => e.id.equals(stackId))).write(
+      StackEntityCompanion(primaryAssetId: Value(primaryAssetId)),
+    );
+  }
 }
 
 extension on StackEntityData {

mobile/lib/platform/native_sync_api.g.dart

@@ -88,6 +88,8 @@ int _deepHash(Object? value) {
 
 enum PlatformAssetPlaybackStyle { unknown, image, video, imageAnimated, livePhoto, videoLooping }
 
+enum EditState { notEdited, edited, unknown }
+
 class PlatformAsset {
   PlatformAsset({
     required this.id,
@@ -395,6 +397,55 @@ class CloudIdResult {
   int get hashCode => _deepHash(<Object?>[runtimeType, ..._toList()]);
 }
 
+class BaseResource {
+  BaseResource({required this.path, required this.sha1, required this.sizeBytes, required this.mimeType});
+
+  String path;
+
+  String sha1;
+
+  int sizeBytes;
+
+  String mimeType;
+
+  List<Object?> _toList() {
+    return <Object?>[path, sha1, sizeBytes, mimeType];
+  }
+
+  Object encode() {
+    return _toList();
+  }
+
+  static BaseResource decode(Object result) {
+    result as List<Object?>;
+    return BaseResource(
+      path: result[0]! as String,
+      sha1: result[1]! as String,
+      sizeBytes: result[2]! as int,
+      mimeType: result[3]! as String,
+    );
+  }
+
+  @override
+  // ignore: avoid_equals_and_hash_code_on_mutable_classes
+  bool operator ==(Object other) {
+    if (other is! BaseResource || other.runtimeType != runtimeType) {
+      return false;
+    }
+    if (identical(this, other)) {
+      return true;
+    }
+    return _deepEquals(path, other.path) &&
+        _deepEquals(sha1, other.sha1) &&
+        _deepEquals(sizeBytes, other.sizeBytes) &&
+        _deepEquals(mimeType, other.mimeType);
+  }
+
+  @override
+  // ignore: avoid_equals_and_hash_code_on_mutable_classes
+  int get hashCode => _deepHash(<Object?>[runtimeType, ..._toList()]);
+}
+
 class _PigeonCodec extends StandardMessageCodec {
   const _PigeonCodec();
   @override
@@ -405,21 +456,27 @@ class _PigeonCodec extends StandardMessageCodec {
     } else if (value is PlatformAssetPlaybackStyle) {
       buffer.putUint8(129);
       writeValue(buffer, value.index);
-    } else if (value is PlatformAsset) {
+    } else if (value is EditState) {
       buffer.putUint8(130);
-      writeValue(buffer, value.encode());
-    } else if (value is PlatformAlbum) {
+      writeValue(buffer, value.index);
+    } else if (value is PlatformAsset) {
       buffer.putUint8(131);
       writeValue(buffer, value.encode());
-    } else if (value is SyncDelta) {
+    } else if (value is PlatformAlbum) {
       buffer.putUint8(132);
       writeValue(buffer, value.encode());
-    } else if (value is HashResult) {
+    } else if (value is SyncDelta) {
       buffer.putUint8(133);
       writeValue(buffer, value.encode());
-    } else if (value is CloudIdResult) {
+    } else if (value is HashResult) {
       buffer.putUint8(134);
       writeValue(buffer, value.encode());
+    } else if (value is CloudIdResult) {
+      buffer.putUint8(135);
+      writeValue(buffer, value.encode());
+    } else if (value is BaseResource) {
+      buffer.putUint8(136);
+      writeValue(buffer, value.encode());
     } else {
       super.writeValue(buffer, value);
     }
@@ -432,15 +489,20 @@ class _PigeonCodec extends StandardMessageCodec {
         final value = readValue(buffer) as int?;
         return value == null ? null : PlatformAssetPlaybackStyle.values[value];
       case 130:
-        return PlatformAsset.decode(readValue(buffer)!);
+        final value = readValue(buffer) as int?;
+        return value == null ? null : EditState.values[value];
       case 131:
-        return PlatformAlbum.decode(readValue(buffer)!);
+        return PlatformAsset.decode(readValue(buffer)!);
       case 132:
-        return SyncDelta.decode(readValue(buffer)!);
+        return PlatformAlbum.decode(readValue(buffer)!);
       case 133:
-        return HashResult.decode(readValue(buffer)!);
+        return SyncDelta.decode(readValue(buffer)!);
       case 134:
+        return HashResult.decode(readValue(buffer)!);
+      case 135:
         return CloudIdResult.decode(readValue(buffer)!);
+      case 136:
+        return BaseResource.decode(readValue(buffer)!);
       default:
         return super.readValueOfType(type, buffer);
     }
@@ -691,4 +753,42 @@ class NativeSyncApi {
     );
     return (pigeonVar_replyValue! as List<Object?>).cast<CloudIdResult>();
   }
+
+  Future<BaseResource?> getBaseResource(String assetId, {bool allowNetworkAccess = false}) async {
+    final pigeonVar_channelName =
+        'dev.flutter.pigeon.immich_mobile.NativeSyncApi.getBaseResource$pigeonVar_messageChannelSuffix';
+    final pigeonVar_channel = BasicMessageChannel<Object?>(
+      pigeonVar_channelName,
+      pigeonChannelCodec,
+      binaryMessenger: pigeonVar_binaryMessenger,
+    );
+    final Future<Object?> pigeonVar_sendFuture = pigeonVar_channel.send(<Object?>[assetId, allowNetworkAccess]);
+    final pigeonVar_replyList = await pigeonVar_sendFuture as List<Object?>?;
+
+    final Object? pigeonVar_replyValue = _extractReplyValueOrThrow(
+      pigeonVar_replyList,
+      pigeonVar_channelName,
+      isNullValid: true,
+    );
+    return pigeonVar_replyValue as BaseResource?;
+  }
+
+  Future<EditState> getEditState(String assetId, {bool allowNetworkAccess = false}) async {
+    final pigeonVar_channelName =
+        'dev.flutter.pigeon.immich_mobile.NativeSyncApi.getEditState$pigeonVar_messageChannelSuffix';
+    final pigeonVar_channel = BasicMessageChannel<Object?>(
+      pigeonVar_channelName,
+      pigeonChannelCodec,
+      binaryMessenger: pigeonVar_binaryMessenger,
+    );
+    final Future<Object?> pigeonVar_sendFuture = pigeonVar_channel.send(<Object?>[assetId, allowNetworkAccess]);
+    final pigeonVar_replyList = await pigeonVar_sendFuture as List<Object?>?;
+
+    final Object? pigeonVar_replyValue = _extractReplyValueOrThrow(
+      pigeonVar_replyList,
+      pigeonVar_channelName,
+      isNullValid: false,
+    );
+    return pigeonVar_replyValue! as EditState;
+  }
 }

mobile/lib/presentation/widgets/images/thumbnail.widget.dart

@@ -296,12 +296,16 @@ class _ThumbnailRenderBox extends RenderBox {
   bool isRepaintBoundary = true;
 
   _ThumbnailRenderBox({
-    required this._image,
-    required this._previousImage,
-    required this._fadeValue,
-    required this._fit,
-    required this._placeholderGradient,
-  });
+    required ui.Image? image,
+    required ui.Image? previousImage,
+    required double fadeValue,
+    required BoxFit fit,
+    required Gradient placeholderGradient,
+  }) : _image = image,
+       _previousImage = previousImage,
+       _fadeValue = fadeValue,
+       _fit = fit,
+       _placeholderGradient = placeholderGradient;
 
   @override
   void paint(PaintingContext context, Offset offset) {

mobile/lib/presentation/widgets/timeline/fixed/row.dart

@@ -62,11 +62,14 @@ class RenderFixedRow extends RenderBox
         RenderBoxContainerDefaultsMixin<RenderBox, _RowParentData> {
   RenderFixedRow({
     List<RenderBox>? children,
-    required this._height,
-    required this._widths,
-    required this._spacing,
-    required this._textDirection,
-  }) {
+    required double height,
+    required List<double> widths,
+    required double spacing,
+    required TextDirection textDirection,
+  }) : _height = height,
+       _widths = widths,
+       _spacing = spacing,
+       _textDirection = textDirection {
     addAll(children);
   }
 

mobile/lib/presentation/widgets/timeline/scrubber.widget.dart

@@ -578,7 +578,9 @@ class _SlideFadeTransition extends StatelessWidget {
   final Animation<double> _animation;
   final Widget _child;
 
-  const _SlideFadeTransition({required this._animation, required this._child});
+  const _SlideFadeTransition({required Animation<double> animation, required Widget child})
+    : _animation = animation,
+      _child = child;
 
   @override
   Widget build(BuildContext context) {

mobile/lib/presentation/widgets/timeline/timeline.widget.dart

@@ -397,7 +397,7 @@ class _SliverTimelineState extends ConsumerState<_SliverTimeline> {
               final grid = CustomScrollView(
                 primary: true,
                 physics: _scrollPhysics,
-                scrollCacheExtent: .pixels(maxHeight * 2),
+                cacheExtent: maxHeight * 2,
                 slivers: [
                   if (isSelectionMode) const SelectionSliverAppBar() else if (widget.appBar != null) widget.appBar!,
                   if (widget.topSliverWidget != null) widget.topSliverWidget!,
@@ -503,7 +503,7 @@ class _SliverTimelineState extends ConsumerState<_SliverTimeline> {
 class _SliverSegmentedList extends SliverMultiBoxAdaptorWidget {
   final List<Segment> _segments;
 
-  const _SliverSegmentedList({required this._segments, required super.delegate});
+  const _SliverSegmentedList({required List<Segment> segments, required super.delegate}) : _segments = segments;
 
   @override
   _RenderSliverTimelineBoxAdaptor createRenderObject(BuildContext context) =>
@@ -527,7 +527,8 @@ class _RenderSliverTimelineBoxAdaptor extends RenderSliverMultiBoxAdaptor {
     markNeedsLayout();
   }
 
-  _RenderSliverTimelineBoxAdaptor({required super.childManager, required this._segments});
+  _RenderSliverTimelineBoxAdaptor({required super.childManager, required List<Segment> segments})
+    : _segments = segments;
 
   int getMinChildIndexForScrollOffset(double offset) =>
       _segments.findByOffset(offset)?.getMinChildIndexForScrollOffset(offset) ?? 0;

mobile/lib/providers/infrastructure/sync.provider.dart

@@ -1,4 +1,5 @@
 import 'package:hooks_riverpod/hooks_riverpod.dart';
+import 'package:immich_mobile/domain/services/edit_revert.service.dart';
 import 'package:immich_mobile/domain/services/hash.service.dart';
 import 'package:immich_mobile/domain/services/local_sync.service.dart';
 import 'package:immich_mobile/domain/services/sync_stream.service.dart';
@@ -11,6 +12,8 @@ import 'package:immich_mobile/providers/infrastructure/asset.provider.dart';
 import 'package:immich_mobile/providers/infrastructure/cancel.provider.dart';
 import 'package:immich_mobile/providers/infrastructure/db.provider.dart';
 import 'package:immich_mobile/providers/infrastructure/platform.provider.dart';
+import 'package:immich_mobile/providers/infrastructure/stack.provider.dart';
+import 'package:immich_mobile/repositories/asset_api.repository.dart';
 import 'package:immich_mobile/repositories/asset_media.repository.dart';
 import 'package:immich_mobile/repositories/permission.repository.dart';
 
@@ -45,11 +48,22 @@ final localSyncServiceProvider = Provider(
   ),
 );
 
+final editRevertServiceProvider = Provider(
+  (ref) => EditRevertService(
+    nativeSyncApi: ref.watch(nativeSyncApiProvider),
+    stackRepository: ref.watch(driftStackProvider),
+    localAssetRepository: ref.watch(localAssetRepository),
+    assetApiRepository: ref.watch(assetApiRepositoryProvider),
+  ),
+);
+
 final hashServiceProvider = Provider(
   (ref) => HashService(
     localAlbumRepository: ref.watch(localAlbumRepository),
     localAssetRepository: ref.watch(localAssetRepository),
     nativeSyncApi: ref.watch(nativeSyncApiProvider),
     trashedLocalAssetRepository: ref.watch(trashedLocalAssetRepository),
+    stackRepository: ref.watch(driftStackProvider),
+    assetApiRepository: ref.watch(assetApiRepositoryProvider),
   ),
 );

mobile/lib/providers/websocket.provider.dart

@@ -105,6 +105,7 @@ class WebsocketNotifier extends StateNotifier<WebsocketState> {
         socket.on('AssetEditReadyV2', _handleSyncAssetEditReadyV2);
         socket.on('on_config_update', _handleOnConfigUpdate);
         socket.on('on_new_release', _handleReleaseUpdates);
+        socket.on('on_asset_stack_update', _handleAssetStackUpdate);
       } catch (e) {
         dPrint(() => "[WEBSOCKET] Catch Websocket Error - ${e.toString()}");
       }
@@ -188,6 +189,13 @@ class WebsocketNotifier extends StateNotifier<WebsocketState> {
     unawaited(_ref.read(backgroundSyncProvider).syncWebsocketEditV2(data));
   }
 
+  // Server stacked/restacked assets (e.g. an edit stacked onto its original).
+  // Pull a fresh remote sync so the stack_entity lands and the timeline shows
+  // the stacked primary instead of briefly hiding the asset.
+  void _handleAssetStackUpdate(dynamic _) {
+    unawaited(_ref.read(backgroundSyncProvider).runFreshRemoteSync());
+  }
+
   void _processBatchedAssetUploadReadyV1() {
     if (_batchedAssetUploadReady.isEmpty) {
       return;

mobile/lib/repositories/asset_api.repository.dart

@@ -67,6 +67,10 @@ class AssetApiRepository extends ApiRepository {
     return _stacksApi.deleteStacks(BulkIdsDto(ids: ids));
   }
 
+  Future<void> setStackPrimary(String stackId, String primaryAssetId) async {
+    await _stacksApi.updateStack(stackId, StackUpdateDto(primaryAssetId: primaryAssetId));
+  }
+
   Future<Response> downloadAsset(String id, {required bool edited}) {
     return _api.downloadAssetWithHttpInfo(id, edited: edited);
   }

mobile/lib/repositories/upload.repository.dart

@@ -30,6 +30,11 @@ class UploadRepository {
       taskStatusCallback: (update) => onUploadStatus?.call(update),
       taskProgressCallback: (update) => onTaskProgress?.call(update),
     );
+    FileDownloader().registerCallbacks(
+      group: kBackupEditPairGroup,
+      taskStatusCallback: (update) => onUploadStatus?.call(update),
+      taskProgressCallback: (update) => onTaskProgress?.call(update),
+    );
     FileDownloader().registerCallbacks(
       group: kManualUploadGroup,
       taskStatusCallback: (update) => onUploadStatus?.call(update),

mobile/lib/services/background_upload.service.dart

@@ -9,17 +9,22 @@ import 'package:immich_mobile/constants/constants.dart';
 import 'package:immich_mobile/domain/models/asset/asset_metadata.model.dart';
 import 'package:immich_mobile/domain/models/asset/base_asset.model.dart';
 import 'package:immich_mobile/domain/models/store.model.dart';
+import 'package:immich_mobile/domain/services/edit_revert.service.dart';
 import 'package:immich_mobile/entities/store.entity.dart';
 import 'package:immich_mobile/extensions/platform_extensions.dart';
 import 'package:immich_mobile/infrastructure/repositories/backup.repository.dart';
 import 'package:immich_mobile/infrastructure/repositories/local_asset.repository.dart';
 import 'package:immich_mobile/infrastructure/repositories/metadata.repository.dart';
 import 'package:immich_mobile/infrastructure/repositories/storage.repository.dart';
+import 'package:immich_mobile/platform/native_sync_api.g.dart';
 import 'package:immich_mobile/providers/infrastructure/asset.provider.dart';
+import 'package:immich_mobile/providers/infrastructure/platform.provider.dart';
 import 'package:immich_mobile/providers/infrastructure/storage.provider.dart';
+import 'package:immich_mobile/providers/infrastructure/sync.provider.dart';
 import 'package:immich_mobile/repositories/asset_media.repository.dart';
 import 'package:immich_mobile/repositories/upload.repository.dart';
 import 'package:immich_mobile/services/api.service.dart';
+import 'package:immich_mobile/services/edit_pair.dart';
 import 'package:immich_mobile/utils/debug_print.dart';
 import 'package:logging/logging.dart';
 import 'package:path/path.dart' as p;
@@ -31,6 +36,8 @@ final backgroundUploadServiceProvider = Provider((ref) {
     ref.watch(localAssetRepository),
     ref.watch(backupRepositoryProvider),
     ref.watch(assetMediaRepositoryProvider),
+    ref.watch(nativeSyncApiProvider),
+    ref.watch(editRevertServiceProvider),
   );
 
   ref.onDispose(service.dispose);
@@ -43,13 +50,35 @@ class UploadTaskMetadata {
   final bool isLivePhotos;
   final String livePhotoVideoId;
 
-  const UploadTaskMetadata({required this.localAssetId, required this.isLivePhotos, required this.livePhotoVideoId});
+  // Marks the base upload of an edit pair. On completion the chained edit
+  // upload is enqueued with stackParentId = this base's remote id.
+  final bool isEditPair;
 
-  UploadTaskMetadata copyWith({String? localAssetId, bool? isLivePhotos, String? livePhotoVideoId}) {
+  // Path of the native temp file backing this task (the edit base), so it can
+  // be cleaned up on terminal status.
+  final String basePath;
+
+  const UploadTaskMetadata({
+    required this.localAssetId,
+    required this.isLivePhotos,
+    required this.livePhotoVideoId,
+    this.isEditPair = false,
+    this.basePath = '',
+  });
+
+  UploadTaskMetadata copyWith({
+    String? localAssetId,
+    bool? isLivePhotos,
+    String? livePhotoVideoId,
+    bool? isEditPair,
+    String? basePath,
+  }) {
     return UploadTaskMetadata(
       localAssetId: localAssetId ?? this.localAssetId,
       isLivePhotos: isLivePhotos ?? this.isLivePhotos,
       livePhotoVideoId: livePhotoVideoId ?? this.livePhotoVideoId,
+      isEditPair: isEditPair ?? this.isEditPair,
+      basePath: basePath ?? this.basePath,
     );
   }
 
@@ -58,6 +87,8 @@ class UploadTaskMetadata {
       'localAssetId': localAssetId,
       'isLivePhotos': isLivePhotos,
       'livePhotoVideoId': livePhotoVideoId,
+      'isEditPair': isEditPair,
+      'basePath': basePath,
     };
   }
 
@@ -66,6 +97,8 @@ class UploadTaskMetadata {
       localAssetId: map['localAssetId'] as String,
       isLivePhotos: map['isLivePhotos'] as bool,
       livePhotoVideoId: map['livePhotoVideoId'] as String,
+      isEditPair: (map['isEditPair'] as bool?) ?? false,
+      basePath: (map['basePath'] as String?) ?? '',
     );
   }
 
@@ -76,7 +109,7 @@ class UploadTaskMetadata {
 
   @override
   String toString() =>
-      'UploadTaskMetadata(localAssetId: $localAssetId, isLivePhotos: $isLivePhotos, livePhotoVideoId: $livePhotoVideoId)';
+      'UploadTaskMetadata(localAssetId: $localAssetId, isLivePhotos: $isLivePhotos, livePhotoVideoId: $livePhotoVideoId, isEditPair: $isEditPair, basePath: $basePath)';
 
   @override
   bool operator ==(covariant UploadTaskMetadata other) {
@@ -86,11 +119,18 @@ class UploadTaskMetadata {
 
     return other.localAssetId == localAssetId &&
         other.isLivePhotos == isLivePhotos &&
-        other.livePhotoVideoId == livePhotoVideoId;
+        other.livePhotoVideoId == livePhotoVideoId &&
+        other.isEditPair == isEditPair &&
+        other.basePath == basePath;
   }
 
   @override
-  int get hashCode => localAssetId.hashCode ^ isLivePhotos.hashCode ^ livePhotoVideoId.hashCode;
+  int get hashCode =>
+      localAssetId.hashCode ^
+      isLivePhotos.hashCode ^
+      livePhotoVideoId.hashCode ^
+      isEditPair.hashCode ^
+      basePath.hashCode;
 }
 
 /// Service for handling background uploads using iOS URLSession (background_downloader)
@@ -104,6 +144,8 @@ class BackgroundUploadService {
     this._localAssetRepository,
     this._backupRepository,
     this._assetMediaRepository,
+    this._nativeSyncApi,
+    this._editRevertService,
   ) {
     _uploadRepository.onUploadStatus = _onUploadCallback;
     _uploadRepository.onTaskProgress = _onTaskProgressCallback;
@@ -114,6 +156,8 @@ class BackgroundUploadService {
   final DriftLocalAssetRepository _localAssetRepository;
   final DriftBackupRepository _backupRepository;
   final AssetMediaRepository _assetMediaRepository;
+  final NativeSyncApi _nativeSyncApi;
+  final EditRevertService _editRevertService;
   final Logger _logger = Logger('BackgroundUploadService');
 
   final StreamController<TaskStatusUpdate> _taskStatusController = StreamController<TaskStatusUpdate>.broadcast();
@@ -193,10 +237,13 @@ class BackgroundUploadService {
 
     await _storageRepository.clearCache();
     await _uploadRepository.reset(kBackupGroup);
+    await _uploadRepository.reset(kBackupEditPairGroup);
     await _uploadRepository.deleteDatabaseRecords(kBackupGroup);
+    await _uploadRepository.deleteDatabaseRecords(kBackupEditPairGroup);
 
     final activeTasks = await _uploadRepository.getActiveTasks(kBackupGroup);
-    return activeTasks.length;
+    final activeEditTasks = await _uploadRepository.getActiveTasks(kBackupEditPairGroup);
+    return activeTasks.length + activeEditTasks.length;
   }
 
   /// Resume background backup processing
@@ -205,9 +252,20 @@ class BackgroundUploadService {
   }
 
   void _handleTaskStatusUpdate(TaskStatusUpdate update) async {
+    UploadTaskMetadata? metadata;
+    if (update.task.metaData.isNotEmpty) {
+      try {
+        metadata = UploadTaskMetadata.fromJson(update.task.metaData);
+      } catch (_) {
+        metadata = null;
+      }
+    }
+
     switch (update.status) {
       case TaskStatus.complete:
-        unawaited(_handleLivePhoto(update));
+        unawaited(_handleLivePhoto(update, metadata));
+        unawaited(handleEditPair(update, metadata));
+        unawaited(recordPriorRemoteIdOnSuccess(update, metadata));
 
         if (CurrentPlatform.isIOS) {
           try {
@@ -220,19 +278,20 @@ class BackgroundUploadService {
 
         break;
 
+      case TaskStatus.failed:
+      case TaskStatus.canceled:
+      case TaskStatus.notFound:
+        unawaited(_cleanupTempResourceOnFailure(metadata));
+        break;
+
       default:
         break;
     }
   }
 
-  Future<void> _handleLivePhoto(TaskStatusUpdate update) async {
+  Future<void> _handleLivePhoto(TaskStatusUpdate update, UploadTaskMetadata? metadata) async {
     try {
-      if (update.task.metaData.isEmpty || update.task.metaData == '') {
-        return;
-      }
-
-      final metadata = UploadTaskMetadata.fromJson(update.task.metaData);
-      if (!metadata.isLivePhotos) {
+      if (metadata == null || !metadata.isLivePhotos) {
         return;
       }
 
@@ -258,6 +317,143 @@ class BackgroundUploadService {
     }
   }
 
+  /// When an edit-pair base upload finishes, enqueue the edit on top of it
+  /// (stackParentId = the base's new remote id).
+  @visibleForTesting
+  Future<void> handleEditPair(TaskStatusUpdate update, UploadTaskMetadata? metadata) async {
+    try {
+      if (metadata == null || !metadata.isEditPair) {
+        return;
+      }
+      if (metadata.basePath.isNotEmpty) {
+        try {
+          await File(metadata.basePath).delete();
+        } catch (_) {}
+      }
+      final baseRemoteId = _remoteIdFromResponse(update);
+      if (baseRemoteId == null) {
+        return;
+      }
+      final localAsset = await _localAssetRepository.getById(metadata.localAssetId);
+      if (localAsset == null) {
+        return;
+      }
+      final editTask = await getEditUploadTask(localAsset, baseRemoteId);
+      if (editTask != null) {
+        await enqueueTasks([editTask]);
+      }
+    } catch (error, stackTrace) {
+      dPrint(() => "Error handling edit pair task: $error $stackTrace");
+    }
+  }
+
+  /// Saves the uploaded remote id as the asset's priorRemoteId so a later edit
+  /// stacks onto it. Skipped for edit-pair base uploads; the chained edit records it.
+  @visibleForTesting
+  Future<void> recordPriorRemoteIdOnSuccess(TaskStatusUpdate update, UploadTaskMetadata? metadata) async {
+    try {
+      if (metadata == null || metadata.isEditPair || metadata.isLivePhotos || metadata.localAssetId.isEmpty) {
+        return;
+      }
+      final remoteId = _remoteIdFromResponse(update);
+      if (remoteId == null) {
+        return;
+      }
+      final localAsset = await _localAssetRepository.getById(metadata.localAssetId);
+      await _localAssetRepository.markSynced(
+        metadata.localAssetId,
+        priorRemoteId: remoteId,
+        syncedChecksum: localAsset?.checksum ?? '',
+      );
+    } catch (error, stackTrace) {
+      dPrint(() => "Error recording priorRemoteId: $error $stackTrace");
+    }
+  }
+
+  Future<void> _cleanupTempResourceOnFailure(UploadTaskMetadata? metadata) async {
+    if (metadata == null || metadata.basePath.isEmpty) {
+      return;
+    }
+    try {
+      await File(metadata.basePath).delete();
+    } catch (_) {}
+  }
+
+  /// The new asset's remote id from an upload's response body, or null if the
+  /// body is missing/malformed.
+  String? _remoteIdFromResponse(TaskStatusUpdate update) {
+    final body = update.responseBody;
+    if (body == null || body.isEmpty) {
+      return null;
+    }
+    try {
+      return jsonDecode(body)['id'] as String?;
+    } catch (_) {
+      return null;
+    }
+  }
+
+  Future<UploadTask> _buildBaseUploadTask(LocalAsset asset, BaseResource base) async {
+    final metadata = UploadTaskMetadata(
+      localAssetId: asset.id,
+      isLivePhotos: false,
+      livePhotoVideoId: '',
+      isEditPair: true,
+      basePath: base.path,
+    ).toJson();
+
+    // The base is the unedited original (no adjustmentTime); the `_base`
+    // deviceAssetId keeps it distinct from the chained edit task.
+    return buildUploadTask(
+      File(base.path),
+      createdAt: asset.createdAt,
+      modifiedAt: asset.updatedAt,
+      originalFileName: p.setExtension(asset.name, p.extension(base.path)),
+      deviceAssetId: '${asset.id}_base',
+      metadata: metadata,
+      group: kBackupGroup,
+      isFavorite: asset.isFavorite,
+      requiresWiFi: _shouldRequireWiFi(asset),
+      cloudId: asset.cloudId,
+      latitude: asset.latitude?.toString(),
+      longitude: asset.longitude?.toString(),
+    );
+  }
+
+  @visibleForTesting
+  Future<UploadTask?> getEditUploadTask(LocalAsset asset, String stackParentId) async {
+    final entity = await _storageRepository.getAssetEntityForAsset(asset);
+    if (entity == null) {
+      return null;
+    }
+    final file = await _storageRepository.getFileForAsset(asset.id);
+    if (file == null) {
+      return null;
+    }
+
+    final fields = {'stackParentId': stackParentId};
+    final originalFileName = await _assetMediaRepository.getOriginalFilename(asset.id) ?? asset.name;
+    final metadata = UploadTaskMetadata(localAssetId: asset.id, isLivePhotos: false, livePhotoVideoId: '').toJson();
+
+    return buildUploadTask(
+      file,
+      createdAt: asset.createdAt,
+      modifiedAt: asset.updatedAt,
+      originalFileName: originalFileName,
+      deviceAssetId: asset.id,
+      metadata: metadata,
+      fields: fields,
+      group: kBackupEditPairGroup,
+      priority: 0,
+      isFavorite: asset.isFavorite,
+      requiresWiFi: _shouldRequireWiFi(asset),
+      cloudId: asset.cloudId,
+      adjustmentTime: asset.adjustmentTime?.toIso8601String(),
+      latitude: asset.latitude?.toString(),
+      longitude: asset.longitude?.toString(),
+    );
+  }
+
   @visibleForTesting
   Future<UploadTask?> getUploadTask(LocalAsset asset, {String group = kBackupGroup, int? priority}) async {
     final entity = await _storageRepository.getAssetEntityForAsset(asset);
@@ -266,6 +462,24 @@ class BackgroundUploadService {
       return null;
     }
 
+    // iOS edit pair: stack a user edit onto its original. resolveEditPair decides
+    // whether to reuse a prior upload or upload the base first. Live photos skip this.
+    if (!entity.isLivePhoto && CurrentPlatform.isIOS) {
+      // A reverted edit flips the stack back to the original and skips the upload.
+      if (asset.priorRemoteId != null && await _editRevertService.tryHandleRevert(asset)) {
+        return null;
+      }
+      final plan = await resolveEditPair(_nativeSyncApi, asset, log: _logger);
+      switch (plan) {
+        case UploadBaseFirst(:final base):
+          return _buildBaseUploadTask(asset, base);
+        case AbsorbIntoPrior(:final parentId):
+          return getEditUploadTask(asset, parentId);
+        case NoEditPair():
+          break;
+      }
+    }
+
     File? file;
 
     /// iOS LivePhoto has two files: a photo and a video.

mobile/lib/services/edit_pair.dart

@@ -0,0 +1,81 @@
+import 'dart:io';
+
+import 'package:immich_mobile/domain/models/asset/base_asset.model.dart';
+import 'package:immich_mobile/platform/native_sync_api.g.dart';
+import 'package:logging/logging.dart';
+
+/// What to do with an edited iOS photo when backing it up.
+sealed class EditPairPlan {
+  const EditPairPlan();
+}
+
+/// Not something we stack: not edited, identical bytes, or couldn't read it.
+class NoEditPair extends EditPairPlan {
+  const NoEditPair();
+}
+
+/// Already uploaded before; stack the edit onto that remote id.
+class AbsorbIntoPrior extends EditPairPlan {
+  final String parentId;
+  const AbsorbIntoPrior(this.parentId);
+}
+
+/// Upload the original first; [base] is its temp file.
+class UploadBaseFirst extends EditPairPlan {
+  final BaseResource base;
+  const UploadBaseFirst(this.base);
+}
+
+/// Works out how an edited photo should stack: reuse a prior upload, upload the
+/// original first, or do nothing. Shared by the foreground and background upload
+/// paths. The caller already checked it's iOS and not a live photo.
+///
+/// A photo that was never edited only carries the capture-time Photographic Style,
+/// which iOS stamps at [LocalAsset.createdAt]; a real edit moves [LocalAsset.adjustmentTime]
+/// later. When they match (or there's no adjustment at all) there's nothing to stack, so
+/// we skip the native read. Anything that moved the timestamp (edit, retime, revert) falls
+/// through to [NativeSyncApi.getBaseResource], which reads the adjustment plist and decides.
+Future<EditPairPlan> resolveEditPair(NativeSyncApi nativeSyncApi, LocalAsset asset, {Logger? log}) async {
+  if (asset.priorRemoteId != null) {
+    return AbsorbIntoPrior(asset.priorRemoteId!);
+  }
+
+  if (!_mightBeEdited(asset)) {
+    return const NoEditPair();
+  }
+
+  BaseResource? base;
+  try {
+    base = await nativeSyncApi.getBaseResource(asset.id, allowNetworkAccess: true);
+  } catch (error, stack) {
+    log?.warning(() => "Failed to read base resource for ${asset.id}", error, stack);
+    return const NoEditPair();
+  }
+  if (base == null) {
+    return const NoEditPair();
+  }
+
+  // Identical bytes (e.g. auto-HDR), nothing real to stack. Drop the temp copy.
+  if (base.sha1 == asset.checksum) {
+    try {
+      await File(base.path).delete();
+    } catch (_) {}
+    return const NoEditPair();
+  }
+
+  return UploadBaseFirst(base);
+}
+
+/// iOS stamps the capture-time Photographic Style at the creation time and moves the
+/// adjustment timestamp on any later change. A gap past a small tolerance (capture jitter
+/// is sub-second, real edits are seconds apart) is worth a native check; no adjustment at
+/// all means the photo was never touched.
+bool _mightBeEdited(LocalAsset asset) {
+  final adjustedAt = asset.adjustmentTime;
+  if (adjustedAt == null) {
+    return false;
+  }
+  return adjustedAt.difference(asset.createdAt).inSeconds.abs() > _editTimestampToleranceSeconds;
+}
+
+const _editTimestampToleranceSeconds = 2;

mobile/lib/services/foreground_upload.service.dart

@@ -6,18 +6,24 @@ import 'package:hooks_riverpod/hooks_riverpod.dart';
 import 'package:immich_mobile/domain/models/asset/asset_metadata.model.dart';
 import 'package:immich_mobile/domain/models/asset/base_asset.model.dart';
 import 'package:immich_mobile/domain/models/store.model.dart';
+import 'package:immich_mobile/domain/services/edit_revert.service.dart';
 import 'package:immich_mobile/entities/store.entity.dart';
 import 'package:immich_mobile/extensions/network_capability_extensions.dart';
 import 'package:immich_mobile/extensions/platform_extensions.dart';
 import 'package:immich_mobile/extensions/translate_extensions.dart';
 import 'package:immich_mobile/infrastructure/repositories/backup.repository.dart';
+import 'package:immich_mobile/infrastructure/repositories/local_asset.repository.dart';
 import 'package:immich_mobile/infrastructure/repositories/metadata.repository.dart';
 import 'package:immich_mobile/infrastructure/repositories/storage.repository.dart';
 import 'package:immich_mobile/platform/connectivity_api.g.dart';
+import 'package:immich_mobile/platform/native_sync_api.g.dart';
+import 'package:immich_mobile/providers/infrastructure/asset.provider.dart';
 import 'package:immich_mobile/providers/infrastructure/platform.provider.dart';
 import 'package:immich_mobile/providers/infrastructure/storage.provider.dart';
+import 'package:immich_mobile/providers/infrastructure/sync.provider.dart';
 import 'package:immich_mobile/repositories/asset_media.repository.dart';
 import 'package:immich_mobile/repositories/upload.repository.dart';
+import 'package:immich_mobile/services/edit_pair.dart';
 import 'package:logging/logging.dart';
 import 'package:path/path.dart' as p;
 import 'package:photo_manager/photo_manager.dart' show PMProgressHandler;
@@ -39,6 +45,9 @@ final foregroundUploadServiceProvider = Provider((ref) {
     ref.watch(backupRepositoryProvider),
     ref.watch(connectivityApiProvider),
     ref.watch(assetMediaRepositoryProvider),
+    ref.watch(nativeSyncApiProvider),
+    ref.watch(localAssetRepository),
+    ref.watch(editRevertServiceProvider),
   );
 });
 
@@ -54,6 +63,9 @@ class ForegroundUploadService {
     this._backupRepository,
     this._connectivityApi,
     this._assetMediaRepository,
+    this._nativeSyncApi,
+    this._localAssetRepository,
+    this._editRevertService,
   );
 
   final UploadRepository _uploadRepository;
@@ -61,6 +73,9 @@ class ForegroundUploadService {
   final DriftBackupRepository _backupRepository;
   final ConnectivityApi _connectivityApi;
   final AssetMediaRepository _assetMediaRepository;
+  final NativeSyncApi _nativeSyncApi;
+  final DriftLocalAssetRepository _localAssetRepository;
+  final EditRevertService _editRevertService;
   final Logger _logger = Logger('ForegroundUploadService');
 
   bool shouldAbortUpload = false;
@@ -250,6 +265,12 @@ class ForegroundUploadService {
         return;
       }
 
+      // A reverted iOS edit flips the stack back to the original and skips the upload.
+      if (CurrentPlatform.isIOS && asset.priorRemoteId != null && await _editRevertService.tryHandleRevert(asset)) {
+        callbacks.onSuccess?.call(asset.localId!, asset.priorRemoteId!);
+        return;
+      }
+
       final isAvailableLocally = await _storageRepository.isAssetAvailableLocally(asset.id);
 
       if (!isAvailableLocally && CurrentPlatform.isIOS) {
@@ -371,6 +392,13 @@ class ForegroundUploadService {
         ]);
       }
 
+      final stackParentId = entity.isLivePhoto
+          ? null
+          : await _maybeUploadBaseResource(asset, Map.of(fields), cancelToken);
+      if (stackParentId != null) {
+        fields['stackParentId'] = stackParentId;
+      }
+
       final onProgress = callbacks.onProgress;
       final result = await _uploadRepository.uploadFile(
         file: file,
@@ -384,6 +412,13 @@ class ForegroundUploadService {
       );
 
       if (result.isSuccess && result.remoteAssetId != null) {
+        unawaited(
+          _localAssetRepository.markSynced(
+            asset.localId!,
+            priorRemoteId: result.remoteAssetId!,
+            syncedChecksum: asset.checksum ?? '',
+          ),
+        );
         callbacks.onSuccess?.call(asset.localId!, result.remoteAssetId!);
       } else if (result.isCancelled) {
         _logger.warning(() => "Backup was cancelled by the user");
@@ -415,6 +450,43 @@ class ForegroundUploadService {
     }
   }
 
+  /// For an edited iOS photo, uploads the original camera bytes and returns its
+  /// remote id to use as the edit's stackParentId. Returns null for non-edits.
+  Future<String?> _maybeUploadBaseResource(
+    LocalAsset asset,
+    Map<String, String> baseFields,
+    Completer<void>? cancelToken,
+  ) async {
+    if (!CurrentPlatform.isIOS) {
+      return null;
+    }
+
+    final plan = await resolveEditPair(_nativeSyncApi, asset, log: _logger);
+    switch (plan) {
+      case NoEditPair():
+        return null;
+      case AbsorbIntoPrior(:final parentId):
+        return parentId;
+      case UploadBaseFirst(:final base):
+        final baseFile = File(base.path);
+        try {
+          final baseName = p.setExtension(asset.name, p.extension(base.path));
+          final result = await _uploadRepository.uploadFile(
+            file: baseFile,
+            originalFileName: baseName,
+            fields: baseFields,
+            cancelToken: cancelToken,
+            logContext: 'baseResource[${asset.localId}]',
+          );
+          return result.isSuccess ? result.remoteAssetId : null;
+        } finally {
+          try {
+            await baseFile.delete();
+          } catch (_) {}
+        }
+    }
+  }
+
   Future<UploadResult> _uploadSingleFile(
     File file, {
     required String deviceAssetId,

mobile/lib/widgets/settings/language_settings.dart

@@ -1,13 +1,12 @@
 import 'dart:async';
-
-import 'package:easy_localization/easy_localization.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_hooks/flutter_hooks.dart';
 import 'package:hooks_riverpod/hooks_riverpod.dart';
+import 'package:easy_localization/easy_localization.dart';
 import 'package:immich_mobile/constants/locales.dart';
-import 'package:immich_mobile/extensions/build_context_extensions.dart';
 import 'package:immich_mobile/extensions/translate_extensions.dart';
 import 'package:immich_mobile/services/localization.service.dart';
+import 'package:immich_mobile/extensions/build_context_extensions.dart';
 import 'package:immich_mobile/widgets/common/search_field.dart';
 
 class LanguageSettings extends HookConsumerWidget {
@@ -85,7 +84,7 @@ class LanguageSettings extends HookConsumerWidget {
                     padding: const EdgeInsets.all(8),
                     itemCount: filteredLocaleEntries.value.length,
                     itemExtent: 64.0,
-                    scrollCacheExtent: const .pixels(100),
+                    cacheExtent: 100,
                     itemBuilder: (context, index) {
                       final countryName = filteredLocaleEntries.value[index].key;
                       final localeValue = filteredLocaleEntries.value[index].value;

mobile/lib/widgets/settings/networking_settings/external_network_preference.dart

@@ -36,6 +36,10 @@ class ExternalNetworkPreference extends HookConsumerWidget {
     }
 
     handleReorder(int oldIndex, int newIndex) {
+      if (oldIndex < newIndex) {
+        newIndex -= 1;
+      }
+
       final entry = entries.value.removeAt(oldIndex);
       entries.value.insert(newIndex, entry);
       entries.value = [...entries.value];
@@ -109,7 +113,7 @@ class ExternalNetworkPreference extends HookConsumerWidget {
                     shrinkWrap: true,
                     physics: const NeverScrollableScrollPhysics(),
                     itemCount: entries.value.length,
-                    onReorderItem: handleReorder,
+                    onReorder: handleReorder,
                     itemBuilder: (context, index) {
                       return EndpointInput(
                         key: Key(index.toString()),

mobile/openapi/lib/api/assets_api.dart

@@ -1252,8 +1252,11 @@ class AssetsApi {
   /// * [MultipartFile] sidecarData:
   ///   Sidecar file data
   ///
+  /// * [String] stackParentId:
+  ///   Stack this asset onto the parent asset, with the new asset as the stack primary
+  ///
   /// * [AssetVisibility] visibility:
-  Future<Response> uploadAssetWithHttpInfo(MultipartFile assetData, DateTime fileCreatedAt, DateTime fileModifiedAt, { String? key, String? slug, String? xImmichChecksum, int? duration, String? filename, bool? isFavorite, String? livePhotoVideoId, List<AssetMetadataUpsertItemDto>? metadata, MultipartFile? sidecarData, AssetVisibility? visibility, }) async {
+  Future<Response> uploadAssetWithHttpInfo(MultipartFile assetData, DateTime fileCreatedAt, DateTime fileModifiedAt, { String? key, String? slug, String? xImmichChecksum, int? duration, String? filename, bool? isFavorite, String? livePhotoVideoId, List<AssetMetadataUpsertItemDto>? metadata, MultipartFile? sidecarData, String? stackParentId, AssetVisibility? visibility, }) async {
     // ignore: prefer_const_declarations
     final apiPath = r'/assets';
 
@@ -1317,6 +1320,10 @@ class AssetsApi {
       mp.fields[r'sidecarData'] = sidecarData.field;
       mp.files.add(sidecarData);
     }
+    if (stackParentId != null) {
+      hasFields = true;
+      mp.fields[r'stackParentId'] = parameterToString(stackParentId);
+    }
     if (visibility != null) {
       hasFields = true;
       mp.fields[r'visibility'] = parameterToString(visibility);
@@ -1376,9 +1383,12 @@ class AssetsApi {
   /// * [MultipartFile] sidecarData:
   ///   Sidecar file data
   ///
+  /// * [String] stackParentId:
+  ///   Stack this asset onto the parent asset, with the new asset as the stack primary
+  ///
   /// * [AssetVisibility] visibility:
-  Future<AssetMediaResponseDto?> uploadAsset(MultipartFile assetData, DateTime fileCreatedAt, DateTime fileModifiedAt, { String? key, String? slug, String? xImmichChecksum, int? duration, String? filename, bool? isFavorite, String? livePhotoVideoId, List<AssetMetadataUpsertItemDto>? metadata, MultipartFile? sidecarData, AssetVisibility? visibility, }) async {
-    final response = await uploadAssetWithHttpInfo(assetData, fileCreatedAt, fileModifiedAt,  key: key, slug: slug, xImmichChecksum: xImmichChecksum, duration: duration, filename: filename, isFavorite: isFavorite, livePhotoVideoId: livePhotoVideoId, metadata: metadata, sidecarData: sidecarData, visibility: visibility, );
+  Future<AssetMediaResponseDto?> uploadAsset(MultipartFile assetData, DateTime fileCreatedAt, DateTime fileModifiedAt, { String? key, String? slug, String? xImmichChecksum, int? duration, String? filename, bool? isFavorite, String? livePhotoVideoId, List<AssetMetadataUpsertItemDto>? metadata, MultipartFile? sidecarData, String? stackParentId, AssetVisibility? visibility, }) async {
+    final response = await uploadAssetWithHttpInfo(assetData, fileCreatedAt, fileModifiedAt,  key: key, slug: slug, xImmichChecksum: xImmichChecksum, duration: duration, filename: filename, isFavorite: isFavorite, livePhotoVideoId: livePhotoVideoId, metadata: metadata, sidecarData: sidecarData, stackParentId: stackParentId, visibility: visibility, );
     if (response.statusCode >= HttpStatus.badRequest) {
       throw ApiException(response.statusCode, await _decodeBodyBytes(response));
     }

mobile/pigeon/native_sync_api.dart

@@ -103,6 +103,21 @@ class CloudIdResult {
   const CloudIdResult({required this.assetId, this.error, this.cloudId});
 }
 
+class BaseResource {
+  final String path;
+  final String sha1;
+  final int sizeBytes;
+  final String mimeType;
+
+  const BaseResource({required this.path, required this.sha1, required this.sizeBytes, required this.mimeType});
+}
+
+// Whether an iOS asset currently carries a user edit, as opposed to a
+// capture-time Photographic Style or a reverted edit. `unknown` means the
+// adjustment data couldn't be read (e.g. the asset is offloaded to iCloud and
+// network wasn't allowed), so callers must not treat it as "not edited".
+enum EditState { notEdited, edited, unknown }
+
 @HostApi()
 abstract class NativeSyncApi {
   bool shouldFullSync();
@@ -140,4 +155,12 @@ abstract class NativeSyncApi {
 
   @TaskQueue(type: TaskQueueType.serialBackgroundThread)
   List<CloudIdResult> getCloudIdForAssetIds(List<String> assetIds);
+
+  @async
+  @TaskQueue(type: TaskQueueType.serialBackgroundThread)
+  BaseResource? getBaseResource(String assetId, {bool allowNetworkAccess = false});
+
+  @async
+  @TaskQueue(type: TaskQueueType.serialBackgroundThread)
+  EditState getEditState(String assetId, {bool allowNetworkAccess = false});
 }

mobile/pubspec.lock

@@ -5,18 +5,18 @@ packages:
     dependency: transitive
     description:
       name: _fe_analyzer_shared
-      sha256: "3b19a47f6ea7c2632760777c78174f47f6aec1e05f0cd611380d4593b8af1dbc"
+      sha256: "8d7ff3948166b8ec5da0fbb5962000926b8e02f2ed9b3e51d1738905fbd4c98d"
       url: "https://pub.dev"
     source: hosted
-    version: "96.0.0"
+    version: "93.0.0"
   analyzer:
     dependency: transitive
     description:
       name: analyzer
-      sha256: "0c516bc4ad36a1a75759e54d5047cb9d15cded4459df01aa35a0b5ec7db2c2a0"
+      sha256: de7148ed2fcec579b19f122c1800933dfa028f6d9fd38a152b04b1516cec120b
       url: "https://pub.dev"
     source: hosted
-    version: "10.2.0"
+    version: "10.0.1"
   ansicolor:
     dependency: transitive
     description:
@@ -1088,10 +1088,10 @@ packages:
     dependency: transitive
     description:
       name: meta
-      sha256: "1741988757a65eb6b36abe716829688cf01910bbf91c34354ff7ec1c3de2b349"
+      sha256: "23f08335362185a5ea2ad3a4e597f1375e78bce8a040df5c600c8d3552ef2394"
       url: "https://pub.dev"
     source: hosted
-    version: "1.18.0"
+    version: "1.17.0"
   mime:
     dependency: transitive
     description:
@@ -1719,10 +1719,10 @@ packages:
     dependency: transitive
     description:
       name: test_api
-      sha256: "949a932224383300f01be9221c39180316445ecb8e7547f70a41a35bf421fb9e"
+      sha256: "8161c84903fd860b26bfdefb7963b3f0b68fee7adea0f59ef805ecca346f0c7a"
       url: "https://pub.dev"
     source: hosted
-    version: "0.7.11"
+    version: "0.7.10"
   thumbhash:
     dependency: "direct main"
     description:
@@ -1775,10 +1775,10 @@ packages:
     dependency: transitive
     description:
       name: url_launcher_android
-      sha256: "17bc677f0b301615530dd1d67e0a9828cafa2d0b6b6eae4cd3679b7eac4a273c"
+      sha256: "3bb000251e55d4a209aa0e2e563309dc9bb2befea2295fd0cec1f51760aac572"
       url: "https://pub.dev"
     source: hosted
-    version: "6.3.30"
+    version: "6.3.29"
   url_launcher_ios:
     dependency: transitive
     description:
@@ -1996,5 +1996,5 @@ packages:
     source: hosted
     version: "3.1.3"
 sdks:
-  dart: ">=3.12.0 <4.0.0"
-  flutter: "3.44.0"
+  dart: ">=3.11.0 <4.0.0"
+  flutter: "3.41.9"

mobile/pubspec.yaml

@@ -5,8 +5,8 @@ publish_to: 'none'
 version: 3.0.0+3047
 
 environment:
-  sdk: '>=3.12.0 <4.0.0'
-  flutter: 3.44.0
+  sdk: '>=3.11.0 <4.0.0'
+  flutter: 3.41.9
 
 dependencies:
   async: ^2.13.1

mobile/test/domain/service.mock.dart

@@ -1,3 +1,4 @@
+import 'package:immich_mobile/domain/services/edit_revert.service.dart';
 import 'package:immich_mobile/domain/services/store.service.dart';
 import 'package:immich_mobile/domain/utils/background_sync.dart';
 import 'package:immich_mobile/platform/native_sync_api.g.dart';
@@ -11,3 +12,5 @@ class MockBackgroundSyncManager extends Mock implements BackgroundSyncManager {}
 class MockNativeSyncApi extends Mock implements NativeSyncApi {}
 
 class MockAppSettingsService extends Mock implements AppSettingsService {}
+
+class MockEditRevertService extends Mock implements EditRevertService {}

mobile/test/drift/main/generated/schema.dart

@@ -30,6 +30,7 @@ import 'schema_v23.dart' as v23;
 import 'schema_v24.dart' as v24;
 import 'schema_v25.dart' as v25;
 import 'schema_v26.dart' as v26;
+import 'schema_v27.dart' as v27;
 
 class GeneratedHelper implements SchemaInstantiationHelper {
   @override
@@ -87,6 +88,8 @@ class GeneratedHelper implements SchemaInstantiationHelper {
         return v25.DatabaseAtV25(db);
       case 26:
         return v26.DatabaseAtV26(db);
+      case 27:
+        return v27.DatabaseAtV27(db);
       default:
         throw MissingSchemaException(version, versions);
     }
@@ -119,5 +122,6 @@ class GeneratedHelper implements SchemaInstantiationHelper {
     24,
     25,
     26,
+    27,
   ];
 }

mobile/test/infrastructure/repository.mock.dart

@@ -5,6 +5,7 @@ import 'package:immich_mobile/infrastructure/repositories/log.repository.dart';
 import 'package:immich_mobile/infrastructure/repositories/metadata.repository.dart';
 import 'package:immich_mobile/infrastructure/repositories/remote_album.repository.dart';
 import 'package:immich_mobile/infrastructure/repositories/remote_asset.repository.dart';
+import 'package:immich_mobile/infrastructure/repositories/stack.repository.dart';
 import 'package:immich_mobile/infrastructure/repositories/storage.repository.dart';
 import 'package:immich_mobile/infrastructure/repositories/store.repository.dart';
 import 'package:immich_mobile/infrastructure/repositories/sync_api.repository.dart';
@@ -36,6 +37,8 @@ class MockRemoteAssetRepository extends Mock implements RemoteAssetRepository {}
 
 class MockTrashedLocalAssetRepository extends Mock implements DriftTrashedLocalAssetRepository {}
 
+class MockDriftStackRepository extends Mock implements DriftStackRepository {}
+
 class MockStorageRepository extends Mock implements StorageRepository {}
 
 class MockDriftBackupRepository extends Mock implements DriftBackupRepository {}

mobile/test/services/background_upload.service_test.dart

@@ -1,11 +1,13 @@
 import 'dart:convert';
 import 'dart:io';
 
+import 'package:background_downloader/background_downloader.dart';
 import 'package:drift/drift.dart' hide isNull, isNotNull;
 import 'package:drift/native.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_test/flutter_test.dart';
+import 'package:immich_mobile/constants/constants.dart';
 import 'package:immich_mobile/domain/models/asset/base_asset.model.dart';
 import 'package:immich_mobile/domain/models/store.model.dart';
 import 'package:immich_mobile/domain/services/store.service.dart';
@@ -13,9 +15,11 @@ import 'package:immich_mobile/entities/store.entity.dart';
 import 'package:immich_mobile/infrastructure/repositories/db.repository.dart';
 import 'package:immich_mobile/infrastructure/repositories/metadata.repository.dart';
 import 'package:immich_mobile/infrastructure/repositories/store.repository.dart';
+import 'package:immich_mobile/platform/native_sync_api.g.dart';
 import 'package:immich_mobile/services/background_upload.service.dart';
 import 'package:mocktail/mocktail.dart';
 
+import '../domain/service.mock.dart';
 import '../fixtures/asset.stub.dart';
 import '../infrastructure/repository.mock.dart';
 import '../mocks/asset_entity.mock.dart';
@@ -28,10 +32,14 @@ void main() {
   late MockDriftLocalAssetRepository mockLocalAssetRepository;
   late MockDriftBackupRepository mockBackupRepository;
   late MockAssetMediaRepository mockAssetMediaRepository;
+  late MockNativeSyncApi mockNativeSyncApi;
+  late MockEditRevertService mockEditRevertService;
   late Drift db;
 
   setUpAll(() async {
     TestWidgetsFlutterBinding.ensureInitialized();
+    registerFallbackValue(LocalAssetStub.image1);
+    registerFallbackValue(<UploadTask>[]);
     TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.setMockMethodCallHandler(
       const MethodChannel('plugins.flutter.io/path_provider'),
       (MethodCall methodCall) async => 'test',
@@ -50,6 +58,8 @@ void main() {
     mockLocalAssetRepository = MockDriftLocalAssetRepository();
     mockBackupRepository = MockDriftBackupRepository();
     mockAssetMediaRepository = MockAssetMediaRepository();
+    mockNativeSyncApi = MockNativeSyncApi();
+    mockEditRevertService = MockEditRevertService();
 
     sut = BackgroundUploadService(
       mockUploadRepository,
@@ -57,8 +67,18 @@ void main() {
       mockLocalAssetRepository,
       mockBackupRepository,
       mockAssetMediaRepository,
+      mockNativeSyncApi,
+      mockEditRevertService,
     );
 
+    // Default: no edit base, so getUploadTask falls through to the normal path.
+    when(
+      () => mockNativeSyncApi.getBaseResource(any(), allowNetworkAccess: any(named: 'allowNetworkAccess')),
+    ).thenAnswer((_) async => null);
+
+    // Default: not a revert, so getUploadTask proceeds with the normal flow.
+    when(() => mockEditRevertService.tryHandleRevert(any())).thenAnswer((_) async => false);
+
     mockUploadRepository.onUploadStatus = (_) {};
     mockUploadRepository.onTaskProgress = (_) {};
   });
@@ -122,6 +142,234 @@ void main() {
     });
   });
 
+  group('getUploadTask edit pair', () {
+    test('absorption: stacks the edit under the prior upload via stackParentId', () async {
+      debugDefaultTargetPlatformOverride = TargetPlatform.iOS;
+      addTearDown(() => debugDefaultTargetPlatformOverride = null);
+
+      final asset = LocalAssetStub.image1.copyWith(priorRemoteId: 'prior-remote-1');
+      final mockEntity = MockAssetEntity();
+      when(() => mockEntity.isLivePhoto).thenReturn(false);
+      when(() => mockStorageRepository.getAssetEntityForAsset(asset)).thenAnswer((_) async => mockEntity);
+      when(() => mockStorageRepository.getFileForAsset(asset.id)).thenAnswer((_) async => File('/path/to/edit.jpg'));
+      when(() => mockAssetMediaRepository.getOriginalFilename(asset.id)).thenAnswer((_) async => 'edit.jpg');
+
+      final task = await sut.getUploadTask(asset);
+
+      expect(task, isNotNull);
+      expect(task!.group, kBackupEditPairGroup);
+      expect(task.fields['stackParentId'], 'prior-remote-1');
+      verifyNever(() => mockNativeSyncApi.getBaseResource(any(), allowNetworkAccess: any(named: 'allowNetworkAccess')));
+    });
+
+    test('builds a base upload task for an unsynced edit', () async {
+      debugDefaultTargetPlatformOverride = TargetPlatform.iOS;
+      addTearDown(() => debugDefaultTargetPlatformOverride = null);
+
+      final asset = LocalAssetStub.image1.copyWith(
+        checksum: 'edited-sha1',
+        adjustmentTime: DateTime(2025, 1, 1, 0, 0, 30),
+      );
+      final mockEntity = MockAssetEntity();
+      when(() => mockEntity.isLivePhoto).thenReturn(false);
+      when(() => mockStorageRepository.getAssetEntityForAsset(asset)).thenAnswer((_) async => mockEntity);
+      when(
+        () => mockNativeSyncApi.getBaseResource(asset.id, allowNetworkAccess: any(named: 'allowNetworkAccess')),
+      ).thenAnswer(
+        (_) async => BaseResource(path: '/tmp/base.jpg', sha1: 'original-sha1', sizeBytes: 100, mimeType: 'image/jpeg'),
+      );
+
+      final task = await sut.getUploadTask(asset);
+
+      expect(task, isNotNull);
+      expect(task!.group, kBackupGroup);
+      expect(task.metaData, contains('"isEditPair":true'));
+    });
+
+    test('falls through to a normal upload when base bytes match the checksum', () async {
+      debugDefaultTargetPlatformOverride = TargetPlatform.iOS;
+      addTearDown(() => debugDefaultTargetPlatformOverride = null);
+
+      final asset = LocalAssetStub.image1.copyWith(
+        checksum: 'same-sha1',
+        adjustmentTime: DateTime(2025, 1, 1, 0, 0, 30),
+      );
+      final mockEntity = MockAssetEntity();
+      when(() => mockEntity.isLivePhoto).thenReturn(false);
+      when(() => mockStorageRepository.getAssetEntityForAsset(asset)).thenAnswer((_) async => mockEntity);
+      when(() => mockStorageRepository.getFileForAsset(asset.id)).thenAnswer((_) async => File('/path/to/file.jpg'));
+      when(() => mockAssetMediaRepository.getOriginalFilename(asset.id)).thenAnswer((_) async => 'photo.jpg');
+      when(
+        () => mockNativeSyncApi.getBaseResource(asset.id, allowNetworkAccess: any(named: 'allowNetworkAccess')),
+      ).thenAnswer(
+        (_) async => BaseResource(path: '/tmp/base.jpg', sha1: 'same-sha1', sizeBytes: 100, mimeType: 'image/jpeg'),
+      );
+
+      final task = await sut.getUploadTask(asset);
+
+      expect(task, isNotNull);
+      expect(task!.group, kBackupGroup);
+      expect(task.fields.containsKey('stackParentId'), isFalse);
+    });
+
+    test('gate: skips the native read for an unedited photo (adjustmentTime == createdAt)', () async {
+      debugDefaultTargetPlatformOverride = TargetPlatform.iOS;
+      addTearDown(() => debugDefaultTargetPlatformOverride = null);
+
+      final asset = LocalAssetStub.image1.copyWith(adjustmentTime: LocalAssetStub.image1.createdAt);
+      final mockEntity = MockAssetEntity();
+      when(() => mockEntity.isLivePhoto).thenReturn(false);
+      when(() => mockStorageRepository.getAssetEntityForAsset(asset)).thenAnswer((_) async => mockEntity);
+      when(() => mockStorageRepository.getFileForAsset(asset.id)).thenAnswer((_) async => File('/path/to/file.jpg'));
+      when(() => mockAssetMediaRepository.getOriginalFilename(asset.id)).thenAnswer((_) async => 'photo.jpg');
+
+      final task = await sut.getUploadTask(asset);
+
+      expect(task, isNotNull);
+      expect(task!.group, kBackupGroup);
+      expect(task.fields.containsKey('stackParentId'), isFalse);
+      verifyNever(() => mockNativeSyncApi.getBaseResource(any(), allowNetworkAccess: any(named: 'allowNetworkAccess')));
+    });
+
+    test('gate: skips the native read when the photo has no adjustmentTime', () async {
+      debugDefaultTargetPlatformOverride = TargetPlatform.iOS;
+      addTearDown(() => debugDefaultTargetPlatformOverride = null);
+
+      final asset = LocalAssetStub.image1; // adjustmentTime is null
+      final mockEntity = MockAssetEntity();
+      when(() => mockEntity.isLivePhoto).thenReturn(false);
+      when(() => mockStorageRepository.getAssetEntityForAsset(asset)).thenAnswer((_) async => mockEntity);
+      when(() => mockStorageRepository.getFileForAsset(asset.id)).thenAnswer((_) async => File('/path/to/file.jpg'));
+      when(() => mockAssetMediaRepository.getOriginalFilename(asset.id)).thenAnswer((_) async => 'photo.jpg');
+
+      final task = await sut.getUploadTask(asset);
+
+      expect(task, isNotNull);
+      expect(task!.group, kBackupGroup);
+      verifyNever(() => mockNativeSyncApi.getBaseResource(any(), allowNetworkAccess: any(named: 'allowNetworkAccess')));
+    });
+  });
+
+  group('edit pair completion', () {
+    test('handleEditPair: enqueues the edit stacked onto the uploaded base', () async {
+      final asset = LocalAssetStub.image1;
+      final metadata = UploadTaskMetadata(
+        localAssetId: asset.id,
+        isLivePhotos: false,
+        livePhotoVideoId: '',
+        isEditPair: true,
+      );
+      final update = TaskStatusUpdate(
+        UploadTask(url: 'http://test-server.com', filename: 'base.jpg'),
+        TaskStatus.complete,
+        null,
+        '{"id":"base-remote-1"}',
+      );
+      final mockEntity = MockAssetEntity();
+      when(() => mockEntity.isLivePhoto).thenReturn(false);
+      when(() => mockLocalAssetRepository.getById(asset.id)).thenAnswer((_) async => asset);
+      when(() => mockStorageRepository.getAssetEntityForAsset(asset)).thenAnswer((_) async => mockEntity);
+      when(() => mockStorageRepository.getFileForAsset(asset.id)).thenAnswer((_) async => File('/path/to/edit.jpg'));
+      when(() => mockAssetMediaRepository.getOriginalFilename(asset.id)).thenAnswer((_) async => 'edit.jpg');
+      when(() => mockUploadRepository.enqueueBackgroundAll(any())).thenAnswer((_) async => [true]);
+
+      await sut.handleEditPair(update, metadata);
+
+      final enqueued =
+          verify(() => mockUploadRepository.enqueueBackgroundAll(captureAny())).captured.single as List<UploadTask>;
+      expect(enqueued.single.fields['stackParentId'], 'base-remote-1');
+      expect(enqueued.single.group, kBackupEditPairGroup);
+    });
+
+    test('handleEditPair: does nothing for a non edit-pair upload', () async {
+      const metadata = UploadTaskMetadata(localAssetId: 'local-1', isLivePhotos: false, livePhotoVideoId: '');
+      final update = TaskStatusUpdate(
+        UploadTask(url: 'http://test-server.com', filename: 'photo.jpg'),
+        TaskStatus.complete,
+        null,
+        '{"id":"remote-1"}',
+      );
+
+      await sut.handleEditPair(update, metadata);
+
+      verifyNever(() => mockUploadRepository.enqueueBackgroundAll(any()));
+    });
+
+    test('recordPriorRemoteIdOnSuccess: marks the local synced with the uploaded id', () async {
+      final asset = LocalAssetStub.image1;
+      final metadata = UploadTaskMetadata(localAssetId: asset.id, isLivePhotos: false, livePhotoVideoId: '');
+      final update = TaskStatusUpdate(
+        UploadTask(url: 'http://test-server.com', filename: 'photo.jpg'),
+        TaskStatus.complete,
+        null,
+        '{"id":"remote-1"}',
+      );
+      when(() => mockLocalAssetRepository.getById(asset.id)).thenAnswer((_) async => asset);
+      when(
+        () => mockLocalAssetRepository.markSynced(
+          any(),
+          priorRemoteId: any(named: 'priorRemoteId'),
+          syncedChecksum: any(named: 'syncedChecksum'),
+        ),
+      ).thenAnswer((_) async {});
+
+      await sut.recordPriorRemoteIdOnSuccess(update, metadata);
+
+      verify(
+        () => mockLocalAssetRepository.markSynced(
+          asset.id,
+          priorRemoteId: 'remote-1',
+          syncedChecksum: asset.checksum ?? '',
+        ),
+      ).called(1);
+    });
+
+    test('recordPriorRemoteIdOnSuccess: skips edit-pair base uploads', () async {
+      const metadata = UploadTaskMetadata(
+        localAssetId: 'local-1',
+        isLivePhotos: false,
+        livePhotoVideoId: '',
+        isEditPair: true,
+      );
+      final update = TaskStatusUpdate(
+        UploadTask(url: 'http://test-server.com', filename: 'base.jpg'),
+        TaskStatus.complete,
+        null,
+        '{"id":"base-remote-1"}',
+      );
+
+      await sut.recordPriorRemoteIdOnSuccess(update, metadata);
+
+      verifyNever(
+        () => mockLocalAssetRepository.markSynced(
+          any(),
+          priorRemoteId: any(named: 'priorRemoteId'),
+          syncedChecksum: any(named: 'syncedChecksum'),
+        ),
+      );
+    });
+
+    test('recordPriorRemoteIdOnSuccess: skips live photos', () async {
+      const metadata = UploadTaskMetadata(localAssetId: 'local-1', isLivePhotos: true, livePhotoVideoId: '');
+      final update = TaskStatusUpdate(
+        UploadTask(url: 'http://test-server.com', filename: 'live.mov'),
+        TaskStatus.complete,
+        null,
+        '{"id":"video-remote-1"}',
+      );
+
+      await sut.recordPriorRemoteIdOnSuccess(update, metadata);
+
+      verifyNever(
+        () => mockLocalAssetRepository.markSynced(
+          any(),
+          priorRemoteId: any(named: 'priorRemoteId'),
+          syncedChecksum: any(named: 'syncedChecksum'),
+        ),
+      );
+    });
+  });
+
   group('getLivePhotoUploadTask', () {
     test('should call getOriginalFilename for live photo upload task', () async {
       final asset = LocalAssetStub.image1;
@@ -172,6 +420,8 @@ void main() {
         mockLocalAssetRepository,
         mockBackupRepository,
         mockAssetMediaRepository,
+        mockNativeSyncApi,
+        mockEditRevertService,
       );
       addTearDown(() => sutWithV24.dispose());
 
@@ -222,6 +472,8 @@ void main() {
         mockLocalAssetRepository,
         mockBackupRepository,
         mockAssetMediaRepository,
+        mockNativeSyncApi,
+        mockEditRevertService,
       );
       addTearDown(() => sutAndroid.dispose());
 
@@ -262,6 +514,8 @@ void main() {
         mockLocalAssetRepository,
         mockBackupRepository,
         mockAssetMediaRepository,
+        mockNativeSyncApi,
+        mockEditRevertService,
       );
       addTearDown(() => sutWithV24.dispose());
 
@@ -302,6 +556,8 @@ void main() {
         mockLocalAssetRepository,
         mockBackupRepository,
         mockAssetMediaRepository,
+        mockNativeSyncApi,
+        mockEditRevertService,
       );
       addTearDown(() => sutWithV24.dispose());
 

mobile/test/unit/mocks.dart

@@ -4,11 +4,14 @@ import 'package:mocktail/mocktail.dart' as mocktail;
 
 import '../domain/service.mock.dart';
 import '../infrastructure/repository.mock.dart';
+import '../repository.mocks.dart';
 
 class UnitMocks {
   final localAlbum = MockLocalAlbumRepository();
   final localAsset = MockDriftLocalAssetRepository();
   final trashedAsset = MockTrashedLocalAssetRepository();
+  final stack = MockDriftStackRepository();
+  final assetApi = MockAssetApiRepository();
 
   final nativeApi = MockNativeSyncApi();
 
@@ -31,6 +34,8 @@ class UnitMocks {
     mocktail.reset(localAlbum);
     mocktail.reset(localAsset);
     mocktail.reset(trashedAsset);
+    mocktail.reset(stack);
+    mocktail.reset(assetApi);
     mocktail.reset(nativeApi);
   }
 }

mobile/test/unit/services/edit_revert_service_test.dart

@@ -0,0 +1,117 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:immich_mobile/domain/models/asset/base_asset.model.dart';
+import 'package:immich_mobile/domain/services/edit_revert.service.dart';
+import 'package:immich_mobile/platform/native_sync_api.g.dart';
+import 'package:mocktail/mocktail.dart';
+
+import '../mocks.dart';
+
+void main() {
+  late EditRevertService sut;
+  final mocks = UnitMocks();
+
+  LocalAsset asset({String? priorRemoteId, String? checksum = 'reverted-sha1'}) => LocalAsset(
+    id: 'local-1',
+    name: 'photo.jpg',
+    type: AssetType.image,
+    createdAt: DateTime(2025),
+    updatedAt: DateTime(2025, 2),
+    playbackStyle: AssetPlaybackStyle.image,
+    isEdited: false,
+    priorRemoteId: priorRemoteId,
+    checksum: checksum,
+  );
+
+  setUp(() {
+    sut = EditRevertService(
+      nativeSyncApi: mocks.nativeApi,
+      stackRepository: mocks.stack,
+      localAssetRepository: mocks.localAsset,
+      assetApiRepository: mocks.assetApi,
+    );
+  });
+
+  tearDown(() {
+    mocks.reset();
+  });
+
+  group('tryHandleRevert', () {
+    test('returns false when the asset was never uploaded as an edit', () async {
+      expect(await sut.tryHandleRevert(asset(priorRemoteId: null)), isFalse);
+      verifyNever(() => mocks.nativeApi.getEditState(any(), allowNetworkAccess: any(named: 'allowNetworkAccess')));
+    });
+
+    test('returns false (lets the pair flow run) when there is still a live edit', () async {
+      when(
+        () => mocks.nativeApi.getEditState('local-1', allowNetworkAccess: any(named: 'allowNetworkAccess')),
+      ).thenAnswer((_) async => EditState.edited);
+
+      expect(await sut.tryHandleRevert(asset(priorRemoteId: 'remote-edit')), isFalse);
+      verifyNever(() => mocks.stack.findStackIdByRemoteId(any()));
+    });
+
+    test('returns false when the edit state cannot be read (offloaded to iCloud)', () async {
+      when(
+        () => mocks.nativeApi.getEditState('local-1', allowNetworkAccess: any(named: 'allowNetworkAccess')),
+      ).thenAnswer((_) async => EditState.unknown);
+
+      expect(await sut.tryHandleRevert(asset(priorRemoteId: 'remote-edit')), isFalse);
+      verifyNever(() => mocks.stack.findStackIdByRemoteId(any()));
+    });
+
+    test('returns false when the prior remote is not in a stack', () async {
+      when(
+        () => mocks.nativeApi.getEditState('local-1', allowNetworkAccess: any(named: 'allowNetworkAccess')),
+      ).thenAnswer((_) async => EditState.notEdited);
+      when(() => mocks.stack.findStackIdByRemoteId('remote-edit')).thenAnswer((_) async => null);
+
+      expect(await sut.tryHandleRevert(asset(priorRemoteId: 'remote-edit')), isFalse);
+      verifyNever(() => mocks.assetApi.setStackPrimary(any(), any()));
+    });
+
+    test('returns false when the stack has no base member to flip back to', () async {
+      when(
+        () => mocks.nativeApi.getEditState('local-1', allowNetworkAccess: any(named: 'allowNetworkAccess')),
+      ).thenAnswer((_) async => EditState.notEdited);
+      when(() => mocks.stack.findStackIdByRemoteId('remote-edit')).thenAnswer((_) async => 'stack-1');
+      when(() => mocks.stack.findStackBaseId('stack-1', excludeId: 'remote-edit')).thenAnswer((_) async => null);
+
+      expect(await sut.tryHandleRevert(asset(priorRemoteId: 'remote-edit')), isFalse);
+      verifyNever(() => mocks.assetApi.setStackPrimary(any(), any()));
+    });
+
+    test('flips the primary back to the base via prior_remote_id and keeps the edit (no trash)', () async {
+      when(
+        () => mocks.nativeApi.getEditState('local-1', allowNetworkAccess: any(named: 'allowNetworkAccess')),
+      ).thenAnswer((_) async => EditState.notEdited);
+      when(() => mocks.stack.findStackIdByRemoteId('remote-edit')).thenAnswer((_) async => 'stack-1');
+      when(
+        () => mocks.stack.findStackBaseId('stack-1', excludeId: 'remote-edit'),
+      ).thenAnswer((_) async => 'remote-base');
+      when(() => mocks.assetApi.setStackPrimary('stack-1', 'remote-base')).thenAnswer((_) async {});
+      when(() => mocks.stack.setPrimary('stack-1', 'remote-base')).thenAnswer((_) async {});
+      when(
+        () => mocks.localAsset.markSynced(
+          'local-1',
+          priorRemoteId: 'remote-base',
+          syncedChecksum: any(named: 'syncedChecksum'),
+        ),
+      ).thenAnswer((_) async {});
+
+      expect(await sut.tryHandleRevert(asset(priorRemoteId: 'remote-edit')), isTrue);
+
+      verify(() => mocks.assetApi.setStackPrimary('stack-1', 'remote-base')).called(1);
+      verify(() => mocks.stack.setPrimary('stack-1', 'remote-base')).called(1);
+      verify(
+        () => mocks.localAsset.markSynced(
+          'local-1',
+          priorRemoteId: 'remote-base',
+          syncedChecksum: any(named: 'syncedChecksum'),
+        ),
+      ).called(1);
+      // Nothing is trashed or unstacked; every edit stays in the stack.
+      verifyNever(() => mocks.assetApi.delete(any(), any()));
+      verifyNever(() => mocks.assetApi.unStack(any()));
+    });
+  });
+}

mobile/test/unit/services/hash_service_test.dart

@@ -1,6 +1,8 @@
+import 'package:flutter/foundation.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:immich_mobile/domain/models/album/local_album.model.dart';
 import 'package:immich_mobile/domain/services/hash.service.dart';
+import 'package:immich_mobile/infrastructure/repositories/stack.repository.dart';
 import 'package:immich_mobile/platform/native_sync_api.g.dart';
 import 'package:mocktail/mocktail.dart';
 
@@ -18,6 +20,8 @@ void main() {
       localAssetRepository: mocks.localAsset,
       nativeSyncApi: mocks.nativeApi,
       trashedLocalAssetRepository: mocks.trashedAsset,
+      stackRepository: mocks.stack,
+      assetApiRepository: mocks.assetApi,
     );
 
     when(() => mocks.localAsset.reconcileHashesFromCloudId()).thenAnswer((_) async => {});
@@ -110,6 +114,8 @@ void main() {
           nativeSyncApi: mocks.nativeApi,
           batchSize: batchSize,
           trashedLocalAssetRepository: mocks.trashedAsset,
+          stackRepository: mocks.stack,
+          assetApiRepository: mocks.assetApi,
         );
 
         final album = LocalAlbumFactory.create();
@@ -183,5 +189,61 @@ void main() {
         verify(() => mocks.nativeApi.hashAssets([asset2.id], allowNetworkAccess: false)).called(1);
       });
     });
+
+    group('iOS revert reconcile', () {
+      test('flips the stack primary for a non-styled revert that re-hashed to the base', () async {
+        debugDefaultTargetPlatformOverride = TargetPlatform.iOS;
+        addTearDown(() => debugDefaultTargetPlatformOverride = null);
+        registerFallbackValue(<String>[]);
+
+        final album = LocalAlbumFactory.create();
+        final asset = LocalAssetFactory.create();
+        when(() => mocks.localAlbum.getBackupAlbums()).thenAnswer((_) async => [album]);
+        when(() => mocks.localAlbum.getAssetsToHash(album.id)).thenAnswer((_) async => [asset]);
+        when(
+          () => mocks.nativeApi.hashAssets([asset.id], allowNetworkAccess: false),
+        ).thenAnswer((_) async => [HashResult(assetId: asset.id, hash: 'h')]);
+
+        const target = StackReconcileTarget(
+          stackId: 'stack-1',
+          newPrimaryId: 'base-1',
+          localAssetId: 'local-1',
+          localAssetChecksum: 'reverted-sha1',
+        );
+        when(() => mocks.stack.findRevertReconcileTargets(any())).thenAnswer((_) async => [target]);
+        when(() => mocks.assetApi.setStackPrimary('stack-1', 'base-1')).thenAnswer((_) async {});
+        when(() => mocks.stack.setPrimary('stack-1', 'base-1')).thenAnswer((_) async {});
+        when(
+          () => mocks.localAsset.markSynced('local-1', priorRemoteId: 'base-1', syncedChecksum: 'reverted-sha1'),
+        ).thenAnswer((_) async {});
+
+        await sut.hashAssets();
+
+        verify(() => mocks.assetApi.setStackPrimary('stack-1', 'base-1')).called(1);
+        verify(() => mocks.stack.setPrimary('stack-1', 'base-1')).called(1);
+        verify(
+          () => mocks.localAsset.markSynced('local-1', priorRemoteId: 'base-1', syncedChecksum: 'reverted-sha1'),
+        ).called(1);
+      });
+
+      test('does not reconcile on a non-iOS platform', () async {
+        debugDefaultTargetPlatformOverride = TargetPlatform.android;
+        addTearDown(() => debugDefaultTargetPlatformOverride = null);
+        registerFallbackValue(<String>[]);
+
+        final album = LocalAlbumFactory.create();
+        final asset = LocalAssetFactory.create();
+        when(() => mocks.localAlbum.getBackupAlbums()).thenAnswer((_) async => [album]);
+        when(() => mocks.localAlbum.getAssetsToHash(album.id)).thenAnswer((_) async => [asset]);
+        when(() => mocks.trashedAsset.getAssetsToHash(any())).thenAnswer((_) async => []);
+        when(
+          () => mocks.nativeApi.hashAssets([asset.id], allowNetworkAccess: false),
+        ).thenAnswer((_) async => [HashResult(assetId: asset.id, hash: 'h')]);
+
+        await sut.hashAssets();
+
+        verifyNever(() => mocks.stack.findRevertReconcileTargets(any()));
+      });
+    });
   });
 }

open-api/immich-openapi-specs.json

@@ -16490,6 +16490,12 @@
             "format": "binary",
             "type": "string"
           },
+          "stackParentId": {
+            "description": "Stack this asset onto the parent asset, with the new asset as the stack primary",
+            "format": "uuid",
+            "pattern": "^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-4[0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12})$",
+            "type": "string"
+          },
           "visibility": {
             "$ref": "#/components/schemas/AssetVisibility"
           }

packages/sdk/src/fetch-client.ts

@@ -630,6 +630,8 @@ export type AssetMediaCreateDto = {
     metadata?: AssetMetadataUpsertItemDto[];
     /** Sidecar file data */
     sidecarData?: Blob;
+    /** Stack this asset onto the parent asset, with the new asset as the stack primary */
+    stackParentId?: string;
     visibility?: AssetVisibility;
 };
 export type AssetMediaResponseDto = {

server/src/dtos/asset-media.dto.ts

@@ -48,6 +48,10 @@ const AssetMediaCreateSchema = AssetMediaBaseSchema.extend({
   isFavorite: stringToBool.optional().describe('Mark as favorite'),
   visibility: AssetVisibilitySchema.optional(),
   livePhotoVideoId: z.uuidv4().optional().describe('Live photo video ID'),
+  stackParentId: z
+    .uuidv4()
+    .optional()
+    .describe('Stack this asset onto the parent asset, with the new asset as the stack primary'),
   metadata: JsonParsed.pipe(z.array(AssetMetadataUpsertItemSchema)).optional().describe('Asset metadata items'),
   [UploadFieldName.SIDECAR_DATA]: z
     .any()

server/src/repositories/stack.repository.ts

@@ -6,7 +6,7 @@ import { columns } from 'src/database';
 import { DummyValue, GenerateSql } from 'src/decorators';
 import { DB } from 'src/schema';
 import { StackTable } from 'src/schema/tables/stack.table';
-import { asUuid, withDefaultVisibility } from 'src/utils/database';
+import { asUuid, isStackPrimaryConstraint, withDefaultVisibility } from 'src/utils/database';
 
 export interface StackSearch {
   ownerId: string;
@@ -124,6 +124,63 @@ export class StackRepository {
     });
   }
 
+  async linkAsset(
+    ownerId: string,
+    newAssetId: string,
+    parentId: string,
+  ): Promise<{ stackId: string; created: boolean } | null> {
+    try {
+      return await this.db.transaction().execute(async (tx) => {
+        // Lock the parent so two concurrent uploads can't each create a stack for it.
+        const parent = await tx
+          .selectFrom('asset')
+          .select(['id', 'ownerId', 'stackId', 'deletedAt'])
+          .where('id', '=', asUuid(parentId))
+          .forUpdate()
+          .executeTakeFirst();
+
+        if (!parent || parent.ownerId !== ownerId || parent.deletedAt) {
+          return null;
+        }
+
+        if (parent.stackId) {
+          await tx
+            .updateTable('asset')
+            .set({ stackId: parent.stackId, updatedAt: new Date() })
+            .where('id', '=', asUuid(newAssetId))
+            .execute();
+          await tx
+            .updateTable('stack')
+            .set({ primaryAssetId: newAssetId, updatedAt: new Date() })
+            .where('id', '=', parent.stackId)
+            .execute();
+          return { stackId: parent.stackId, created: false };
+        }
+
+        const stack = await tx
+          .insertInto('stack')
+          .values({ ownerId, primaryAssetId: newAssetId })
+          .returning('id')
+          .executeTakeFirstOrThrow();
+
+        await tx
+          .updateTable('asset')
+          .set({ stackId: stack.id, updatedAt: new Date() })
+          .where('id', 'in', [asUuid(newAssetId), parent.id])
+          .execute();
+
+        return { stackId: stack.id, created: true };
+      });
+    } catch (error) {
+      // newAssetId may already be another stack's primary (e.g. a retried upload).
+      // Treat the unique-constraint hit as "couldn't stack" rather than a 500.
+      if (isStackPrimaryConstraint(error)) {
+        return null;
+      }
+      throw error;
+    }
+  }
+
   @GenerateSql({ params: [DummyValue.UUID] })
   async delete(id: string): Promise<void> {
     await this.db.deleteFrom('stack').where('id', '=', asUuid(id)).execute();

server/src/services/asset-media.service.spec.ts

@@ -418,6 +418,79 @@ describe(AssetMediaService.name, () => {
       expect(mocks.asset.update).not.toHaveBeenCalled();
     });
 
+    it('should stack a new asset onto the parent and emit the populated stackId', async () => {
+      const file = {
+        uuid: 'random-uuid',
+        originalPath: 'fake_path/asset_1.jpeg',
+        mimeType: 'image/jpeg',
+        checksum: Buffer.from('file hash', 'utf8'),
+        originalName: 'asset_1.jpeg',
+        size: 42,
+      };
+      const parent = AssetFactory.create();
+      mocks.access.asset.checkOwnerAccess.mockResolvedValue(new Set([parent.id]));
+      mocks.asset.getById.mockResolvedValueOnce(getForAsset(parent));
+      mocks.asset.create.mockResolvedValue(assetEntity);
+      mocks.stack.linkAsset.mockResolvedValue({ stackId: 'stack-1', created: true });
+
+      await expect(sut.uploadAsset(authStub.user1, { ...createDto, stackParentId: parent.id }, file)).resolves.toEqual({
+        id: 'id_1',
+        status: AssetMediaStatus.CREATED,
+      });
+
+      expect(mocks.stack.linkAsset).toHaveBeenCalledWith(authStub.user1.user.id, assetEntity.id, parent.id);
+      expect(mocks.event.emit).toHaveBeenCalledWith('AssetCreate', {
+        asset: expect.objectContaining({ stackId: 'stack-1' }),
+      });
+    });
+
+    it('should reject stacking onto a trashed asset', async () => {
+      const file = {
+        uuid: 'random-uuid',
+        originalPath: 'fake_path/asset_1.jpeg',
+        mimeType: 'image/jpeg',
+        checksum: Buffer.from('file hash', 'utf8'),
+        originalName: 'asset_1.jpeg',
+        size: 42,
+      };
+      const parent = AssetFactory.create();
+      mocks.access.asset.checkOwnerAccess.mockResolvedValue(new Set([parent.id]));
+      mocks.asset.getById.mockResolvedValueOnce({ ...getForAsset(parent), deletedAt: new Date() });
+
+      await expect(
+        sut.uploadAsset(authStub.user1, { ...createDto, stackParentId: parent.id }, file),
+      ).rejects.toBeInstanceOf(BadRequestException);
+
+      expect(mocks.asset.create).not.toHaveBeenCalled();
+      expect(mocks.stack.linkAsset).not.toHaveBeenCalled();
+    });
+
+    it('should adopt a duplicate into the stack when stacking', async () => {
+      const file = {
+        uuid: 'random-uuid',
+        originalPath: 'fake_path/asset_1.jpeg',
+        mimeType: 'image/jpeg',
+        checksum: Buffer.from('file hash', 'utf8'),
+        originalName: 'asset_1.jpeg',
+        size: 0,
+      };
+      const parent = AssetFactory.create();
+      const error = new Error('unique key violation');
+      (error as any).constraint_name = ASSET_CHECKSUM_CONSTRAINT;
+      mocks.access.asset.checkOwnerAccess.mockResolvedValue(new Set([parent.id]));
+      mocks.asset.getById.mockResolvedValueOnce(getForAsset(parent));
+      mocks.asset.create.mockRejectedValue(error);
+      mocks.asset.getUploadAssetIdByChecksum.mockResolvedValue('dup-id');
+      mocks.stack.linkAsset.mockResolvedValue({ stackId: 'stack-1', created: false });
+
+      await expect(sut.uploadAsset(authStub.user1, { ...createDto, stackParentId: parent.id }, file)).resolves.toEqual({
+        id: 'dup-id',
+        status: AssetMediaStatus.DUPLICATE,
+      });
+
+      expect(mocks.stack.linkAsset).toHaveBeenCalledWith(authStub.user1.user.id, 'dup-id', parent.id);
+    });
+
     it('should hide the linked motion asset', async () => {
       const motionAsset = AssetFactory.from({ type: AssetType.Video }).owner(authStub.user1.user).build();
       const asset = AssetFactory.create();

server/src/services/asset-media.service.ts

@@ -140,26 +140,63 @@ export class AssetMediaService extends BaseService {
 
       this.requireQuota(auth, file.size);
 
+      if (dto.stackParentId) {
+        if (auth.sharedLink) {
+          throw new BadRequestException('Cannot stack an asset uploaded via shared link');
+        }
+        await this.requireAccess({ auth, permission: Permission.AssetUpdate, ids: [dto.stackParentId] });
+        const parent = await this.assetRepository.getById(dto.stackParentId);
+        if (!parent || parent.deletedAt) {
+          throw new BadRequestException('Cannot stack onto a trashed or missing asset');
+        }
+      }
+
       if (dto.livePhotoVideoId) {
         await onBeforeLink(
           { asset: this.assetRepository, event: this.eventRepository },
           { userId: auth.user.id, livePhotoVideoId: dto.livePhotoVideoId },
         );
       }
-      const asset = await this.create(auth.user.id, dto, file, sidecarFile);
+      // When stacking, defer the AssetCreate event and emit it below with the
+      // populated stackId, so clients don't briefly see the asset as standalone.
+      const asset = await this.create(auth.user.id, dto, file, sidecarFile, { skipEventEmit: !!dto.stackParentId });
 
       if (auth.sharedLink) {
         await this.addToSharedLink(auth.sharedLink, asset.id);
       }
 
+      if (dto.stackParentId) {
+        const linkResult = await this.linkToStackParent(auth.user.id, asset.id, dto.stackParentId);
+        await this.eventRepository.emit('AssetCreate', {
+          asset: linkResult ? { ...asset, stackId: linkResult.stackId } : asset,
+        });
+      }
+
       await this.userRepository.updateUsage(auth.user.id, file.size);
 
       return { id: asset.id, status: AssetMediaStatus.CREATED };
     } catch (error: any) {
-      return this.handleUploadError(error, auth, file, sidecarFile);
+      return this.handleUploadError(error, auth, file, sidecarFile, dto.stackParentId);
     }
   }
 
+  private async linkToStackParent(
+    ownerId: string,
+    newAssetId: string,
+    parentId: string,
+  ): Promise<{ stackId: string; created: boolean } | null> {
+    const result = await this.stackRepository.linkAsset(ownerId, newAssetId, parentId);
+    if (!result) {
+      this.logger.warn(`Could not link asset ${newAssetId} to stack parent ${parentId}: parent missing or not owned`);
+      return null;
+    }
+    await this.eventRepository.emit(result.created ? 'StackCreate' : 'StackUpdate', {
+      stackId: result.stackId,
+      userId: ownerId,
+    });
+    return result;
+  }
+
   async downloadOriginal(auth: AuthDto, id: string, dto: AssetDownloadOriginalDto): Promise<ImmichFileResponse> {
     await this.requireAccess({ auth, permission: Permission.AssetDownload, ids: [id] });
 
@@ -290,6 +327,7 @@ export class AssetMediaService extends BaseService {
     auth: AuthDto,
     file: UploadFile,
     sidecarFile?: UploadFile,
+    stackParentId?: string,
   ): Promise<AssetMediaResponseDto> {
     // clean up files
     await this.jobRepository.queue({
@@ -309,6 +347,12 @@ export class AssetMediaService extends BaseService {
         await this.addToSharedLink(auth.sharedLink, duplicateId);
       }
 
+      if (stackParentId) {
+        // Adopt the existing duplicate into the stack so a re-uploaded edit still
+        // stacks instead of silently staying separate.
+        await this.linkToStackParent(auth.user.id, duplicateId, stackParentId);
+      }
+
       this.logger.debug(`Duplicate asset upload rejected: existing asset ${duplicateId}`);
       return { status: AssetMediaStatus.DUPLICATE, id: duplicateId };
     }
@@ -317,7 +361,13 @@ export class AssetMediaService extends BaseService {
     throw error;
   }
 
-  private async create(ownerId: string, dto: AssetMediaCreateDto, file: UploadFile, sidecarFile?: UploadFile) {
+  private async create(
+    ownerId: string,
+    dto: AssetMediaCreateDto,
+    file: UploadFile,
+    sidecarFile?: UploadFile,
+    options?: { skipEventEmit?: boolean },
+  ) {
     const asset = await this.assetRepository.create({
       ownerId,
       libraryId: null,
@@ -356,7 +406,9 @@ export class AssetMediaService extends BaseService {
       lockedPropertiesBehavior: 'override',
     });
 
-    await this.eventRepository.emit('AssetCreate', { asset });
+    if (!options?.skipEventEmit) {
+      await this.eventRepository.emit('AssetCreate', { asset });
+    }
 
     await this.jobRepository.queue({ name: JobName.AssetExtractMetadata, data: { id: asset.id, source: 'upload' } });
 

server/src/utils/database.ts

@@ -76,6 +76,12 @@ export const isAssetChecksumConstraint = (error: unknown) => {
   return (error as PostgresError)?.constraint_name === 'UQ_assets_owner_checksum';
 };
 
+export const STACK_PRIMARY_CONSTRAINT = 'stack_primaryAssetId_uq';
+
+export const isStackPrimaryConstraint = (error: unknown) => {
+  return (error as PostgresError)?.constraint_name === STACK_PRIMARY_CONSTRAINT;
+};
+
 export function withDefaultVisibility<O>(qb: SelectQueryBuilder<DB, 'asset', O>) {
   return qb.where('asset.visibility', 'in', [sql.lit(AssetVisibility.Archive), sql.lit(AssetVisibility.Timeline)]);
 }