I want to store 2 images using multer. I think I should use fields, but I don’t know How to use it although I serched a lot.

import path from "path";
import multer from 'multer'
import prisma from "@/lib/prisma";

const latest = await prisma.items.findFirst({
  orderBy: {
    id: 'desc',
  },
});

const latestName = latest.name.replaceAll(" ", "-")
const formData = await req.formData();

const thumbnail = formData.get("thumbnail");
const cover = formData.get("cover")

const storage = multer.diskStorage({
  destination: function (req, file, cb) {
    cb(null, 'public/uploads/') 
  },
  filename: function (req, file, cb) {
    cb(null, latestName + '-' + file.fieldname + path.extname(file.originalname))
  }
});

I want name a file by recieve latest data’s name and fields name.But I’m stuck at here