This would be helpful if you scanned and saved a health history update, and then were given a medication list, you could add it onto that same saved document. Another instance would be, you could add correspondence from another provider onto original saved referral document. Or if a page was forgotten, you can just click "Add More" or "Add to Document" and scan the page to its existing document.
this is already possible just click on the botton that shows a paper with a plus sign (modify Document), once you have done that go to the file bar above the thumbnail documents and click on the green plus sign with paper and add the new document. be sure to click on the fist button (modify document)