public static function sai_mod__SYSTEM_SAI_saimod_sys_files_action_upload($cat)
 {
     if (!\SYSTEM\FILES\files::put($cat, basename($_FILES['datei_' . $cat]['name']), $_FILES['datei_' . $cat]['tmp_name'])) {
         throw new \SYSTEM\LOG\ERROR("upload problem");
     }
     return \SYSTEM\LOG\JsonResult::ok();
 }