Comment 1 for bug 1920630

This gets may vote. This is my single biggest issue WRT RPD . Issues arise in the real world, cards unplugged, devices switched off, so it's never 100% that you downloaded all your photos.
So either, I leave everything on SD cards , until suddenly I'm out on a shoot an realise the cards are full and just reformat assuming I've backed it all up, or I do some kind of "visual scan" each time I download and hope to spot any missing.

Both these to lost data.

Far better that a computer checks the downloads against the card than my "best guess"