fix: resume upload on launch (really fix it) (#21106)

mobile/lib/utils/migration.dart

@@ -223,14 +223,14 @@ class _DeviceAsset {
   const _DeviceAsset({required this.assetId, this.hash, this.dateTime});
 }
 
-Future<List<void>> runNewSync(WidgetRef ref, {bool full = false}) async {
+Future<List<void>> runNewSync(WidgetRef ref, {bool full = false}) {
   ref.read(backupProvider.notifier).cancelBackup();
 
   final backgroundManager = ref.read(backgroundSyncProvider);
   return Future.wait([
     backgroundManager.syncLocal(full: full).then((_) {
       Logger("runNewSync").fine("Hashing assets after syncLocal");
-      backgroundManager.hashAssets();
+      return backgroundManager.hashAssets();
     }),
     backgroundManager.syncRemote(),
   ]);