Http listening to upload progress Flutter Web - flutter

Question

I was trying to listen to the upload progress using StreamedRequest and wanted to show the upload progress in UI by listening to bytes sent, but for some reason, it doesn't seem to work. The file is being picked with the file picker package and the selected file is in binary format (Unit8List). Here's the code:
final sha1OfFileData = sha1.convert(fileData);
try {
final request = http.StreamedRequest('POST', Uri.parse(data['uploadUrl']));
request.headers.addAll({
'Authorization': data['authorizationToken'],
'Content-Type': "application/octet-stream",
'X-Bz-File-Name': fileName,
'X-Bz-Content-Sha1': sha1OfFileData.toString(),
'X-Bz-Server-Side-Encryption': 'AES256',
});
request.sink.add(fileData);
final streamedResponse = await request.send();
var received = 0;
var total = streamedResponse.contentLength ?? -1;
streamedResponse.stream.listen(
(List<int> chunk) {
received += chunk.length;
if (total == -1) {
print('Received $received bytes');
} else {
final progress = received / total;
print('Upload progress: ${(progress * 100).toStringAsFixed(2)}%');
}
},
onDone: () async {
final responseBytes = await streamedResponse.stream.toBytes();
final responseString = utf8.decode(responseBytes);
response = jsonDecode(responseString);
print(response);
},
onError: (error) {
print('Error uploading file: $error');
},
cancelOnError: true,
);
} catch (e) {
print(e);
}
However if I upload it with the normal request, it works, here's that code:
final sha1OfFileData = sha1.convert(fileData);
var response;
try {
final request = http.Request('POST', Uri.parse(data['uploadUrl']));
request.headers.addAll({
'Authorization': data['authorizationToken'],
'Content-Type': "application/octet-stream",
'X-Bz-File-Name': fileName,
'X-Bz-Content-Sha1': sha1OfFileData.toString(),
'X-Bz-Server-Side-Encryption': 'AES256',
});
request.bodyBytes = fileData;
final streamedResponse = await request.send();
final responseBytes = await streamedResponse.stream.toBytes();
final responseString = utf8.decode(responseBytes);
response = jsonDecode(responseString);
print(response);
} catch (e) {
print(e);
}