Flutter Firebase Storage not woriking: no default bucket

Question

I am trying to upload a pdf-file to Firebase-Storage using this function:

  static Future<String> savePdf({
    required Uint8List assetAsUint8List,
    required String fileName,
    required DocumentType documentType,
  }) async {
    String path =
        '${BackendService().keys.studs}/${AuthenticationService().currentUser?.uid}/${documentType.name}/$fileName';

    await FirebaseStorage.instanceFor().ref(path).putData(
          assetAsUint8List,
        );
    return FirebaseStorage.instance.ref(path).getDownloadURL();
  }

but this fails with this error:

Unhandled Exception: [firebase_storage/no-bucket] No default storage bucket could be found. Ensure you have correctly followed the Getting Started guide.

I configure my app like this inside my main:

Future main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp(
    options: kIsWeb || Platform.isAndroid
        ? FirebaseOptions(
            apiKey: "my-api-key",
            appId: "my-app-id",
            messagingSenderId: "my-messaing-sender-id",
            projectId: "appflug",
          )
        : null,
  );
  runApp(
    const App(),
  );
}

It is actually working on iOS! But NOT on Android or Web...

I followed the documentation but it is simply not working... I coulnd't find anything helpful on this!

What am I missing here?

Let me know if you need any more info!

Solution

The solution was rather simple: I needed to add the storageBucket in my FirebaseOptions so my main looks like this:

Future main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp(
    options: kIsWeb || Platform.isAndroid
        ? FirebaseOptions(
            apiKey: "my-app-key",
            appId: "my-app-id",
            messagingSenderId: "my-messaging-sender-id",
            projectId: "my-project-id",
            storageBucket: "myapp.appspot.com",
          )
        : null,
  );
  runApp(
    const App(),
  );
}