Dropzone Plus is a hosted service by the Dropzone team that handles form uploads (with and without files) for you. It takes care of everything, once the data leaves the browser of your customers.
After creating an account on https://plus.dropzone.dev you get a URL that you can use as the endpoint of your forms. You can send simple form data to it and also include files. The service is reliable and robust, and you get email notifications whenever a form was submitted, as well as a dashboard where you can access and download your data.