public function postDelete($mediaId)
    {
        $media = Media::findOrFail($mediaId);
        $media->delete();

        return redirect($this->admin->currentUrl())->with('notifications_below_header', [['type' => 'success', 'icon' => 'check-circle', 'title' => 'Success!', 'message' => 'The Media was successfully deleted.', 'dismissable' => false]]);
    }