def _put_object(self, filename, bucket, key, callback, extra_args):
        # We're using open_file_chunk_reader so we can take advantage of the
        # progress callback functionality.
        open_chunk_reader = self._osutil.open_file_chunk_reader
        with open_chunk_reader(
            filename,
            0,
            self._osutil.get_file_size(filename),
            callback=callback,
        ) as body:
            self._client.put_object(
                Bucket=bucket, Key=key, Body=body, **extra_args
            )