docs: def _get_zip_filename(self):
          """Create a filename for zip file when :class:Transfer.compress is
          set to ``True``
  
          :rtype: str
          """
  
          date = datetime.datetime.now().strftime('%Y_%m_%d-%H%M%S')
          zip_file = 'filemail_transfer_{date}.zip'.format(date=date)
  
          return zip_file