/**
  * Upload file, save to storage and db
  * @return bool
  */
 public function actionUpload()
 {
     $model = new FileUpload();
     $model->setAttributes(Yii::$app->request->post());
     if ($model->save()) {
         return true;
     }
     return json_encode(['error' => 'Model save errors: ' . json_encode($model->getErrors())]);
 }