public function actionFilemanager()
{
$this->layout = '@vendor/nubors/yii2-filemanager/views/layouts/main';
$model = new Mediafile();
$dataProvider = $model->search();
$dataProvider->pagination->defaultPageSize = 15;
return $this->render('filemanager', ['model' => $model, 'dataProvider' => $dataProvider]);
}