code: def _download_chunk(self, chunk_offset, chunk_size):
          
          range_id = 'bytes={0}-{1}'.format(
              chunk_offset, chunk_offset + chunk_size - 1)
  
          return self._blob_service.get_blob(
              container_name=self._container_name,
              blob_name=self._blob_name,
              x_ms_range=range_id)
docs: Reads or downloads the received blob from the system.