使用Node.js上传文件时遇到问题

Question

postman screenshot我正在尝试使用NodeJS与邮递员将图像文件上传到Firebase存储。文件正在按未定义方式打印，请在代码下方找到

const express = require("express");
const router = express.Router();
const Multer = require('multer');
const fileupload = require('./fileupload.js');
const upload = Multer({ storage: Multer.memoryStorage(), limits: { fileSize: 5 * 1024 * 1024 } });

router.post("/", upload.single('file'), fileupload.upload);

module.exports = router;

fileupload.js

exports.upload = (req, res) => {
    let file = req.file;
    console.log(file);
    if (!file) {
        res.send('file not found');
        return;
    }
    res.send('file found');
}