mongosoft\file\UploadBehavior::getUploadUrl PHP Метод

    public function getUploadUrl($attribute)
    {
        /** @var BaseActiveRecord $model */
        $model = $this->owner;
        $url = $this->resolvePath($this->url);
        $fileName = $model->getOldAttribute($attribute);
        return $fileName ? Yii::getAlias($url . '/' . $fileName) : null;
    }