nemmo\attachments\behaviors\FileBehavior::saveUploads PHP Method

    public function saveUploads($event)
    {
        $files = UploadedFile::getInstancesByName('UploadForm[file]');
        if (!empty($files)) {
            foreach ($files as $file) {
                if (!$file->saveAs($this->getModule()->getUserDirPath() . $file->name)) {
                    throw new \Exception(\Yii::t('yii', 'File upload failed.'));
                }
            }
        }
        $userTempDir = $this->getModule()->getUserDirPath();
        foreach (FileHelper::findFiles($userTempDir) as $file) {
            if (!$this->getModule()->attachFile($file, $this->owner)) {
                throw new \Exception(\Yii::t('yii', 'File upload failed.'));
            }
        }
        rmdir($userTempDir);
    }