load documents to a registration form

After a person registers for our event and picks an appointment time we need to to upload documents to verify their address and kids.

How would I go about allowing this to happen and is their any extra cost for doing an upload file into a registration submission?

Hi arlingtonchristmaswish,

As a fellow Jotform user, you can add File Upload element to your forms and customize this element's default settings. This guide shows how you do this.