mdm\upload\UploadBehavior::init PHP Method

    public function init()
    {
        $this->uploadPath = Yii::getAlias($this->uploadPath);
    }

 /**
  * @inheritdoc
  */
 public function init()
 {
     parent::init();
     $this->uploadPath = Yii::getAlias($this->uploadPath);
 }