public function updateDescription($descr)
    {
        $app = Application::getFacadeApplication();
        $this->fvDescription = $descr;
        $this->save();
        $this->logVersionUpdate(self::UT_DESCRIPTION);
        $fve = new FileVersionEvent($this);
        $app->make(EventDispatcherInterface::class)->dispatch('on_file_version_update_description', $fve);
    }