docs: def _add_payload_files(zip_file, payload_info_list):
      """Add the payload files to the zip."""
      payload_byte_count = 0
      payload_file_count = 0
      for payload_info_dict in payload_info_list:
          zip_file.write_iter(payload_info_dict['path'], payload_info_dict['iter'])
          payload_byte_count += payload_info_dict['iter'].size
          payload_file_count += 1
      return payload_byte_count, payload_file_count