Before Submit the form

add_filter('fluent_file_uploaded', function($uploadFile, $formData, $form) {
    $url = $uploadFile['url'];
    $uploadDir = str_replace('/', '\/', FLUENTFORM_UPLOAD_DIR.'/temp' );
    $pattern = "/(?<=${uploadDir}\/).*$/";
    preg_match($pattern, $url, $match);
    if (!empty($match)) {
        $file = str_replace($match[0], \FluentForm\App\Helpers\Protector::decrypt($match[0]), $url);
    }
    return $file ;
},10,3);