This is a bug that has been staying for 4+ years and it really grinds my gears.

When I select more than 100 photos and videos in "Camera Roll" folder and move them to another folder, OneDrive moves actually no more than 100-200 files, then tells wrong that it has moved all the files I selected in upper right corner.

This bug doesn't rely on browser and subscription (I'm currently on Office 365 for Students and tried in Chrome, Opera, Firefox, Edge), but probably it's specific to my account.