Flutter cannot get download url firebase-storage - flutter

Question

While trying to upload byteArray to the bucket in firebase storage, the file uploads to the storage but I cannot get the downloadUrl back from the file. I am getting the reference of bucket like this:
Future<Reference> get storageRef async {
final _bucketUrl = await bucketUrl;
return FirebaseStorage.instanceFor(bucket: _bucketUrl).ref();
}
And Uploading image like this:
Future<String> uploadImageByteArray({
#required Uint8List byteArray,
String fileName,
}) async {
final name = fileName ?? DateTime.now().toIso8601String();
final _ref = await storageRef;
final _refUrl = _ref.child("images/$name.png");
print(_refUrl.fullPath);
final uploadTask = _refUrl.putData(byteArray);
final snapshot = await uploadTask;
return snapshot.ref.getDownloadURL();
}
From above code I am getting this error:
Unhandled Exception: type 'NoSuchMethodError' is not a subtype of type 'Exception'.
It works if I get reference for the FirebaseStorage only and not the bucket like this:
Future<Reference> get storageRef{
return FirebaseStorage.instance.ref();
}
I cannot implement without using bucket reference because there can be different bucket urls depending on the tenants. What am I doing wrong?
Edit => Recent Developments:
I found out that it works if I get the downloadurl from the _refUrl itself. i.e:
String downloadUrl = _refUrl.getDownloadUrl();
It works but I can't help but wonder if it is correct implementation.

Answer 1

Your edit makes perfect sense since you have the reference to the uploaded file with _refUrl, fetching its long-lived download URL works as expected (That's how I have done it before btw). I don't have access to a project with FirebaseStorage to test this, but You can try printing snapshot.ref.fullPath and compare it with the fullPath of _refUrl.

Answer 2

try this
Future<String> uploadImageByteArray({
#required Uint8List byteArray,
String fileName,
}) async {
final name = fileName ?? DateTime.now().toIso8601String();
final _ref = await storageRef;
final _refUrl = _ref.child("images/$name.png");
print(_refUrl.fullPath);
final uploadTask = _refUrl.putData(byteArray);
final snapshot = (await uploadTask);
String url = await snapshot.ref.getDownloadURL(); // await
return url;
}