Multiple Medical Form Uploads

Is there a way to upload BSA Part A&B and then a separate upload for Part C for individual user accounts? Or do I have to merge everything into one document before uploading?

It seems that when I upload a second medical form that it replaces the previously uploaded form.

Most of the time Part C comes in months after A&B, only when needed as a separate document. It would be very difficult to find the original A&B file and merge every time there is an updated form.