in order to upload the files, you will need to have either CSS Form Builder or Universal Email for the File Manipulation -> Upload file server behavior, and Data Assist (if you are using Security Assist V1, V2 already sues the Data Assist insert behaivor on the registration page) to store the file name in the data base.
the registration page is basicly an insert record page.
see the "How to apply Digital File Pro to DataAssist Insert and Update pages" tutorial on the data assist support page:
dataassist/