Get req.body from multipart/form-data?

Question

JavaScript

There is a mixed form in which there are fields with text information and a field for files. The essence of the problem is that I need to form the path for the files according to the information of one of the fields. But I can't get access to this information (I'm getting it too late)

router.post('/add', async (req, res) => {
    const storage = multer.diskStorage({
        destination(req, file, cb) {
            console.log(req.body) // undefined
            cb(null, 'storage/')
        },
        filename(req, file, cb) {
            console.log(req.body) // undefined
            cb(null, file.originalname)
        }
    })
    const upload = multer({
        storage
    }).fields([{name: 'files'}, {name: 'title'}])
    upload(req, res, (err) => {
        console.log(req.body) // сформированный объект с title
    })
})

How can req.body be accessed in the destination or filename functions?