Middleware перед Multer?

const insertDB = async (req, next) => {
  const { num, visible, name } = req.body;
  if (!name) next(new Error('MISSING_PARAMS'));

  const category = await models.GalleryCategory.create({ num, visible, name });
  req.categoryId = category.id;
};

const fileFilterCreateCategory = async (req, file, next) => {
  if (!allowedTypes.includes(file.mimetype)) {
    return next(new Error('LIMIT_FILE_TYPES'));
  }

  await insertDB(req, next);

  return next(null, true);
};

const storageCreateCategory = multer.diskStorage({
  destination: (req, file, cb) => cb(null, pathGalleryCategories),
  filename: (req, file, cb) => cb(null, req.categoryId.toString())
});

const uploadCreateCategory = multer({
  fileFilter: fileFilterCreateCategory,
  limits: { fileSize: process.env.APP_MAX_FILE_SIZE },
  storage: storageCreateCategory
});

routes.post(
  '',
  uploadCreateCategory.single('file'),
  async (req, res, next) => {
    if (!req.file) await insertDB(req, next);
    next();
  },
  (req, res) => res.json({ id: req.categoryId })
);