Function key

backend/routes/uploadRoute.js:34–36

(req, file, cb)

  acl: 'public-read',
  contentType: multerS3.AUTO_CONTENT_TYPE,
  key(req, file, cb) {
    cb(null, file.originalname);
  },
});
const uploadS3 = multer({ storage: storageS3 });
router.post('/s3', uploadS3.single('image'), (req, res) => {