def _multipart_upload(self, local_file, bucket, s3_file):
        transfer_config = TransferConfig(multipart_threshold=1024 * 25,
                                         multipart_chunksize=1024 * 25,
                                         use_threads=False)
        self.s3_resource.Object(bucket, s3_file).upload_file(local_file,
                                                             Config=transfer_config,
                                                             Callback=ProgressPercentage(local_file))