I just got my S10+ a few days ago and noticed this problem right away. I have to be able to move my photos from folder to folder. Since the phone already came with Google Photos on it, I checked there first to see if you could move the pics on there, and you can! Yay! Even better though, is that it also duplicates the effect in your normal S10 gallery. I hope this works out for you as well as it did for me. 🙂🙂🙂
I had same problem. I figured it out. Open gallery click on pics you want to move. Instead of hitting the 3 dots like normal, click beside the search bar. But buttons are hidden. Idk why.