modules/media/controllers/DefaultController.php
public function actionUpload()
    {
        /**
         * @var \kato\modules\media\Media $module
         */
        $module = \Yii::$app->controller->module;
        $result = $module->mediaUpload();

        $response = new Response();
        $response->format = Response::FORMAT_JSON;
        $response->setStatusCode(500);

        if ($result['success'] === true) {

            if ($this->doMediaJoin($result)) {
                //success
                $response->setStatusCode(200);
                $response->data = $result['data'];
                $response->send();
                Yii::$app->end();
            } else {
                $response->statusText = 'Unable to do join of media with content.';
                $response->send();
                Yii::$app->end();
            }

        } else {
            $response->statusText = $result['message'];
            $response->send();
            Yii::$app->end();
        }
    }
public function actionUpload()
    {
        /**
         * @var \kato\modules\media\Media $module
         */
        $module = \Yii::$app->controller->module;
        $result = $module->mediaUpload();

        $response = new Response();
        $response->format = Response::FORMAT_JSON;
        $response->setStatusCode(500);

        if ($result['success'] === true) {

            if ($this->doMediaJoin($result)) {
                //success
                $response->setStatusCode(200);
                $response->data = $result['data'];
                $response->send();
                Yii::$app->end();
            } else {
                $response->statusText = 'Unable to do join of media with content.';
                $response->send();
                Yii::$app->end();
            }

        } else {
            $response->statusText = $result['message'];
            $response->send();
            Yii::$app->end();
        }
    }
Uploads the file and update database