React: validate FormData (server-side) before uploading the file

Current Situation

In the front-end side of the application I have a simple form, from where I can get 3 parameters for the data before uploading it to the back-end:

The form submition function

e.preventDefault();
const data = new FormData(e.currentTarget) //contains a string key called title

data.append("file", JSON.stringify(file)) //file object
data.append("description", JSON.stringify(editorState)) //description object

handleSubmit(e, data)

To prevent any error, I have some client-side validations (cannot upload if some parameters are empty). This is how I fetch the data:

handleSubmit

await fetch(process.env.NEXT_PUBLIC_DR_HOST, {
    method: 'POST',
    body: body, //body is the data argument
}).then(res =>
{
    // window.location = res.url;
})

After that, the data will be sent to the server:

The server

router.post('/', upload.single('file'), validateDbData, tryAsync(async (req, res, next) =>

And using the multer middleware(upload.single('file')), the file will be uploaded respectively (storage).

The Problem

As you can see, after the upload.single('file') middleware, comes another one called validateDbData. This is the code for it:

const declarationSchema = Joi.object({
    title: Joi.string().required(),
    description: Joi.object().required(),
    file: Joi.object()
})

const { error } = declarationSchema.validate(
    req.body
)

console.log(error)

if (error)
{
    const msg = error.details.map(e => e.message).join(',') //
    throw new ServerError("Invalid Data", 400)
}
else
{
    next()
}

And if there is something wrong (say the title is empty) an error is thrown, so the server-side validation works. But, the upload.single('file') middleware is called before the validateDbData validation midleware. This means that even if there is an error and everything got canceled, the file remained uploaded in the cloud (storage).

Question

How can I validate the data inside the FormData on the server before uploading the file parameter to the cloud (storage)? The multer middleware accepts only multipart/form-data, so reversing the middleware order will not work.

Potential solution: express-fileupload