    def test_multi_file(
        self,
        driver,
        live_server,
        freeze,
        upload_file,
        another_upload_file,
        yet_another_upload_file,
The software uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the software does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.