Upload Blob Url to Firebase Storage | Flutter - flutter

Question

So I already read about the topic but I simply didn't understand the solutions on stack.
I came up with this code:
Im saving a url looking like this:
final String myDataUrl = file.url;
print(myDataUrl);
blob:http://localhost:51947/2952a3b1-db6a-4882-a42a-8e1bf0a0ad73
& then Im trying to add it into Firebase Storage with the putString operator, that I guessed that suited me best while reading the Documentation. I thought that I have a Url and therefore should be able to upload it like this:
FirebaseStorage.instance
.ref()
.child("bla")
.putString(myDataUrl, format: PutStringFormat.dataUrl);
But it doesn't work, it says that:
Error: Invalid argument (uri): Scheme must be 'data': Instance of '_Uri'
So Im guessing that it somehow can't format my url to one that is accepted.
What can I do different to upload a blob successfully to firebase Storage?
-----------------Answer----------------------
Answer in the comment of the answer.
You have to convert your Blob to a Uint8List & upload it like:
Future<Uint8List> fileConverter() async {
final reader = html.FileReader();
reader.readAsArrayBuffer(file!);
await reader.onLoad.first;
return reader.result as Uint8List;
}
and then put it into your Storage:
Future uploadFile(String uid) async {
if (file == null) return;
final path = "nachweise/$uid";
Uint8List fileConverted = await fileConverter();
try {
FirebaseStorage.instance
.ref()
.child(path)
.putData(fileConverted)
.then((bla) => print("sucess"));
} on FirebaseException catch (e) {
return null;
}
}

Answer 1

The Firebase Storage SDKs can upload local data as either a File, an array of bytes, or a base-64 encoded string. The only URLs it accepts are so-called data URLs, which start with data:// and contain the complete data of the object. They cannot upload data directly from URLs that you more commonly see, such as http:// or https://.
You'll need to first download the data from that URL to the local device, and then upload it from there.