mongosoft\file\UploadBehavior::getUploadPath PHP Method

    public function getUploadPath($attribute, $old = false)
    {
        /** @var BaseActiveRecord $model */
        $model = $this->owner;
        $path = $this->resolvePath($this->path);
        $fileName = $old === true ? $model->getOldAttribute($attribute) : $model->{$attribute};
        return $fileName ? Yii::getAlias($path . '/' . $fileName) : null;
    }