def METHOD_NAME(self, file_id: str) -> str:
    """Return a URL for a file in the manager.
    Parameters
    ----------
    file_id
        The file's ID, returned from load_media_and_get_id().
    Returns
    -------
    str
        A URL that the frontend can load the file from. Because this
        URL may expire, it should not be cached!
    Raises
    ------
    MediaFileStorageError
        Raised if the manager doesn't contain an object with the given ID.
    """
    raise NotImplementedError