Export Signatures & Uploaded Image from Forms - or how do form signatures work?

Before I shell out cash for the premium business account, how do form signatures work?

Use case is I have a form where I collect info which I then need to populate a PDF and save the PDF with the signature.

How can I do this? My main question is…Are the signature image files exportable along with all the form info so I can later generate signed PDFs? I also need to use the upload image field to include a photo of their ID.

Thanks in advance for any insight!

How do you solve this? I have the use case but I can create and populate a PDF with the signature neither and email response.