How can I get the upload progress?
var driveApi = ga.DriveApi(client);
var fileToUpload = File(sfilePath + sfileName + '.jpg');
var response = await driveApi.files.create(ga.File()..name = 'my_file.jpg',
uploadMedia: ga.Media(fileToUpload.openRead(), fileToUpload.lengthSync()));
print(response.toJson());
Even on stackoverflows existing questions there is only this example but never with the progress for uploading. Have anybody an idea, please?