Am I missing something - there doesn't seem to be an option to simply upload an existing adobe file in my forms...?? Only options are to create a new document or use a template. When I go to File - open, it just opens a new window with the same two options.
We currently do not support that. We are working on the ability to import an existing fillable PDF form into FormsCentral and collect data. It should be out in the coming weeks.
In the meantime could you send us copies of your fillable PDF forms so we can test them? If your interested, please send them to firstname.lastname@example.org