is not acknowledged.

        :Parameters:
          - `database`: database to use.
          - `bucket_name` (optional): The name of the bucket. Defaults to 'fs'.
          - `chunk_size_bytes` (optional): The chunk size in bytes. Defaults
            to 255KB.
          - `write_concern` (optional): The
            :class:`~pymongo.write_concern.WriteConcern` to use. If ``None``
            (the default) db.write_concern is used.
          - `read_preference` (optional): The read preference to use. If
            ``None`` (the default) db.read_preference is used.

        .. versionchanged:: 4.0
           Removed the `disable_md5` parameter. See
           :ref:`removed-gridfs-checksum` for details.

        .. versionchanged:: 3.11
           Running a GridFSBucket operation in a transaction now always raises
           an error. GridFSBucket does not support multi-document transactions.

        .. versionchanged:: 3.7
           Added the `disable_md5` parameter.

        .. versionadded:: 3.1

        .. seealso:: The MongoDB documentation on `gridfs <https://dochub.mongodb.org/core/gridfs>`_.
        r#