Source Code added

mobile/lib/providers/backup/asset_upload_progress.provider.dart

@@ -0,0 +1,33 @@
+import 'package:cancellation_token_http/http.dart';
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+
+/// Tracks per-asset upload progress.
+/// Key: local asset ID, Value: upload progress 0.0 to 1.0, or -1.0 for error
+class AssetUploadProgressNotifier extends Notifier<Map<String, double>> {
+  static const double errorValue = -1.0;
+
+  @override
+  Map<String, double> build() => {};
+
+  void setProgress(String localAssetId, double progress) {
+    state = {...state, localAssetId: progress};
+  }
+
+  void setError(String localAssetId) {
+    state = {...state, localAssetId: errorValue};
+  }
+
+  void remove(String localAssetId) {
+    state = Map.from(state)..remove(localAssetId);
+  }
+
+  void clear() {
+    state = {};
+  }
+}
+
+final assetUploadProgressProvider = NotifierProvider<AssetUploadProgressNotifier, Map<String, double>>(
+  AssetUploadProgressNotifier.new,
+);
+
+final manualUploadCancelTokenProvider = StateProvider<CancellationToken?>((ref) => null);