added support for simultan downloads in files and talk, support for background downloads, enhanced loading in files with retry

android/app/src/main/AndroidManifest.xml

@@ -67,6 +67,16 @@
             android:name="com.dexterous.flutterlocalnotifications.ActionBroadcastReceiver"
             android:exported="false" />
 
+        <!-- background_downloader runs large/long downloads in a foreground
+             service (WorkManager) so they survive the app being backgrounded and
+             beat the default 9-minute WorkManager timeout. On API 34+ the
+             dataSync foreground service type must be declared explicitly here;
+             see the FOREGROUND_SERVICE_DATA_SYNC permission below. -->
+        <service
+            android:name="androidx.work.impl.foreground.SystemForegroundService"
+            android:foregroundServiceType="dataSync"
+            tools:node="merge" />
+
         <!-- Receiver classes live at the package root (NOT under .widgets) because
              the home_widget Flutter plugin resolves them as <app-package>.<name>. -->
         <receiver
@@ -127,6 +137,11 @@
          FirebaseMessaging.requestPermission(); without this declaration the
          locally rendered push notifications are silently dropped. -->
     <uses-permission android:name="android.permission.POST_NOTIFICATIONS"/>
+    <!-- background_downloader foreground service for large/long downloads that
+         must keep running while the app is backgrounded. DATA_SYNC is the
+         required type declaration on Android 14+ (API 34+). -->
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE"/>
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_DATA_SYNC"/>
     <!-- Workmanager periodic widget refresh needs to reschedule after device
          reboot, otherwise the widget freezes until the user opens the app. -->
     <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>