docs: def add_content_to_asset(self,
                               asset_id,
                               asset_data=None,
                               asset_url=None,
                               asset_content_type=None,
                               asset_label=None):
          """stub"""
          # This method creates a new AssetContent related to the given asset_id:
          return self._add_asset_content(asset_id=asset_id,
                                         asset_data=asset_data,
                                         asset_url=asset_url,
                                         asset_content_type=asset_content_type,
                                         asset_label=asset_label)