docs: def load_collection_from_file(resource, filename, content_type=None):
      """
      Creates a new collection for the registered resource and calls
      `load_into_collection_from_file` with it.
      """
      coll = create_staging_collection(resource)
      load_into_collection_from_file(coll, filename,
                                     content_type=content_type)
      return coll