파일 업로드 중 path undefined 에러

파일을 업로드하고 돌아오는 response를 콘솔에 찍으려고 하는데

아래와 같은 에러가 출력됩니다 ㅜㅜ

success 메시지에 url을 제외하면 화면에서 응답은 받고 있는데 문제가 무엇일까요 ㅜㅜ?

[0] C:\Users\User\Desktop\boilerplate-mern-stack\server\routes\video.js:39

url: res.req.file.path,

[0] ^

[0]

[0] TypeError: Cannot read property 'path' of undefined

[0] at C:\Users\User\Desktop\boilerplate-mern-stack\server\routes\video.js:39:25

[0] at Array.<anonymous> (C:\Users\User\Desktop\boilerplate-mern-stack\node_modules\multer\lib\make-middleware.js:53:37)

[0] at listener (C:\Users\User\Desktop\boilerplate-mern-stack\node_modules\on-finished\index.js:169:15)

[0] at onFinish (C:\Users\User\Desktop\boilerplate-mern-stack\node_modules\on-finished\index.js:100:5)

[0] at callback (C:\Users\User\Desktop\boilerplate-mern-stack\node_modules\ee-first\index.js:55:10)

[0] at IncomingMessage.onevent (C:\Users\User\Desktop\boilerplate-mern-stack\node_modules\ee-first\index.js:93:5)

[0] at IncomingMessage.emit (events.js:333:22)

[0] at endReadableNT (_stream_readable.js:1204:12)

[0] at processTicksAndRejections (internal/process/task_queues.js:84:21)

[1] [HPM] Error occurred while trying to proxy request /api/video/uploadfiles from localhost:3000 to http://localhost:5000/ (ECONNRESET) (https://nodejs.org/api/errors.html#errors_common_system_errors)

[0] [nodemon] app crashed - waiting for file changes before starting...

let storage = multer.diskStorage({
  destination: (req, file, callback) => {
    callback(null, "uploads/");
  },
  filename: (req, file, callback) => {
    callback(null, `${Date.now()}_${file.originalname}`);
  },
  fileFilter: (req, file, callback) => {
    const ext = path.extname(file.originalname);
    if (ext !== ".mp4") {
      return callback(res.status(400).end("only mp4 is allowed"), false);
    }
    callback(null, true);
  }
});

const upload = multer({
  storage: storage
}).single("file");
//=================================
//             Video
//=================================

router.post("/uploadfiles", (req, res) => {
  // 비디오를 서버에 저장한다.
  upload(req, res, err => {
    if (err) {
      return res.json({ success: false, err });
    }
    return res.json({
      success: true,
      url: res.req.file.path,
      fileName: res.req.file.filename
    });
  });
});

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