docs: def _generate_processed_key_name(process_to, upload_name):
          """Returns a key name to use after processing based on timestamp and
          upload key name."""
          timestamp = datetime.now().strftime('%Y%m%d%H%M%S%f')
          name, extension = os.path.splitext(upload_name)
          digest = md5(''.join([timestamp, upload_name])).hexdigest()
          return os.path.join(process_to, '{0}.{1}'.format(digest, extension))