That's a tough one, we do not have a. Upload control for Sitefintiy FormBuilder yet, however we're currently working on developing a solution for the upcoming releases.
Concerning instantiating a dynamic module content item upon submitting the form what you can do is override the defualt FormsControl and subscribe to
event which will allow you to access the user filled form data. For more information on how you can achieve this please take a look at this blog post
the Telerik team
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items