[firebase_storage] video upload operation

[mrkaraaslan]

I am building an application where users can upload videos.

• First users upload video.
• Then download url is created.
• Then url is saved to firestore database.

In general, everything works fine but I have some problems.

1. Sometimes (very rare) uploaded videos are 0 bytes. There a many videos uploaded and I have seen this behavior only 7 or 8 times
2. When users cancel upload operation using uploadTask.cancel(), system prints:

Android

[firebase_storage/canceled] User canceled the upload/download.

IOS

[firebase_storage/unknown] An unknown error occurred, please check the server response.

3. TaskState.error and TaskState.canceled are never fired.

uploadTask.snapshotEvents.listen((TaskSnapshot taskSnapshot) async {
  // THIS LINE NEVER PRINTS ERROR OR CANCELED
  print(taskSnapshot.state);

  switch (taskSnapshot.state) {
    case TaskState.running:
      if (context.mounted) {
        setState(() {
          progress = taskSnapshot.bytesTransferred / taskSnapshot.totalBytes;
        });
      }
      break;
    case TaskState.success:
      if (context.mounted) {
        setState(() {
          done = true;
        });
      }
      break;
    case TaskState.error:
      print("error")
      break;
    case TaskState.canceled:
      print("canceled")
      break;
    case TaskState.paused:
      print("paused")
      break;
  }
}, onError: (err) {
  // BOTH ERROR MESSAGES PRINTED HERE
  print(err);
});

Thank you.