Forum\Controller\User\Registration\RegistrationSaveController::postSave PHP Method

    protected function postSave(Data $user)
    {
        if (false !== SingleImageDragField::uploadFromController($this, 'avatar', $user, AvatarUploadHelper::getPath($user->id))) {
            $this->model->save($user);
        }
        parent::postSave($user);
    }