docs: def record_file_factory(self):
          """Load default record file factory."""
          try:
              get_distribution('invenio-records-files')
              from invenio_records_files.utils import record_file_factory
              default = record_file_factory
          except DistributionNotFound:
              def default(pid, record, filename):
                  return None
  
          return load_or_import_from_config(
              'PREVIEWER_RECORD_FILE_FACOTRY',
              app=self.app,
              default=default,
          )