App\Http\Controllers\Laralum\Laralum::mustBeFile PHP Method

    public static function mustBeFile($file_name)
    {
        if (!Laralum::isFile($file_name)) {
            abort(404);
        }
    }

 public static function deleteFile($file_name)
 {
     Laralum::mustBeFile($file_name);
     Storage::delete($file_name);
 }