我是上传文件的新手，我想上传不同产品的图像到Firebase存储和应用程序中需要的另一个文件，一个产品可以有许多图像，所以我想为每个产品创建一个文件夹，文件夹的名称将是产品的ID。
在代码中：我使用@google-cloud/storage库将文件上传到firebase存储，但我在文档中搜索，没有办法创建一个文件夹，然后将其上传到文件夹。

这里是我的代码：

我创建了multer的中间件，将其传递到端点，检查类型为文件。

const express = require("express");
const Multer = require("multer");
const { Storage } = require("@google-cloud/storage")

const storage = new Storage({
    projectId: process.env.PROJECT_FIREBASE_ID,
    keyFilename: "hawat-service.json",
});
const bucket = storage.bucket(process.env.BUCKET_NAME);

const multer = Multer({
    storage: Multer.memoryStorage(),
    fileFilter: (req, file, cb) => {
        checkFileType(req, file, cb);
    }
})

const checkFileType = (req ,file, cb) => {
    if (file.fieldname == 'cover' || file.fieldname == 'images') {
        if (!file.originalname.match(/\.(jpg|JPG|jpeg|JPEG|png|PNG|gif|GIF)$/)) {
              req.error = new Error( "Only images are allowed")
            return  cb(null, false);
        }
    } else if (file.fieldname == 'card' || file.fieldname == 'licence') {
        if (!file.originalname.match(/\.(pdf|jpg|JPG|jpeg|JPEG|png|PNG|gif|GIF)$/)) {
           req.error = new Error("Only images and pdf are allowed")
            return  cb(null, false);

        }
    }
    return cb(null, true)
}

module.exports = (req, res, next) => {

    return multer.fields([{ name: 'cover', maxCount: 1 },
    { name: 'images', maxCount: 5 }, { name: 'card', maxCount: 1 },
    { name: 'licence', maxCount: 1 }
])
        (req, res, () => {
            if (req.error) return res.status(400).send( {message : req.error.message })
            next()
        })
       
}

上传文件的功能是

const express = require("express");
const Multer = require("multer");
const { Storage } = require("@google-cloud/storage");

const storage = new Storage({
  projectId: process.env.PROJECT_FIREBASE_ID,
  keyFilename: "hawat-service.json",
});

const bucket = storage.bucket(process.env.BUCKET_NAME);

module.exports = {
  upload: async ( file) => {
    return new Promise((resolve, reject) => {
      let newFileName = `${file.originalname}_${Date.now()}`;
  
      let fileUpload = bucket.file(newFileName);

      const createStream = fileUpload.createWriteStream({
          metadata: {
              contentType: file.mimetype
          }
      });

      createStream.on('error', (error) => {
        console.log("error in uploading is" , error)
          reject('Something is wrong! Unable to upload at the moment.');
      });

      createStream.on('finish', () => {
          // The public URL can be used to directly access the file via HTTP.
          const url = `https://storage.googleapis.com/${bucket.name}/${fileUpload.name}`;
       
      //   storage.bucket(process.env.BUCKET_NAME).file(fileUpload.name).makePublic();
     

             resolve(url);
      });

      createStream.end(file.buffer);
  });

该端点是

router.post('/add-product' , auth, multer , seller.onAddProduct)

函数onAddProduct是可以从用户接收多个文件的函数。
那么我如何为每个产品创建一个文件夹，然后上传文件夹中的文件？
另外，我如何删除创建后的文件夹？