Photos not in albums not found by Photo Transer App

iPad to PC:
the App does not seem to "see" photos that were not in albums.

I noticed while backing up photos that there were a lot of pictures not transfered from my iPad to the computer.

in the iPad Photos, there are a few tabs: Photos, Stream, Albums etc. the "Photos" refers to all photos on my iPad. I have photos in that tab that I can't find in any of the "Albums" hence they are not part of any.

The App does not seem to consider them.

My workaround: created a "lost and found" album on iPad. Moved all from "photos" into that album, then transfer them to my PC. Sort them out on my PC then resync to iPad.

I know it creates a lot of duplicates but that's the only way I found to preserve all my photos.

Maybe add a "not in album" choice when transferring would be great in the app.