When using the scan feature on Drive, it would be great to add the ability to add a document or photo to the sequence of scanned documents like in Google Drive. For example say I have a PDF or JPEG saved on my phone and 2 physical pages to scan, but I want to join them into a single 3 page PDF. I would be able to add the digital page from my phone's files as page 1, and then scan the physical pages as pages 2 and 3.