Try a soft reboot by turning the phone Off and On.
If launching your gallery app and pressing the 3 dots in the Rh Corner of the screen to invoke the pop up where amongst other options ‘Create Albumk is Then if you try to move a picture by long holding on it and choose ‘Move to Album ‘ does pressing the + Create Album ‘ work ?
If not try going into settings - apps - Gallery - Storage - Clear Data and Clear Cache - and try again.
If that does not help then a very last resort is to back up and factory reset.
Final option is to go to a Samsung Service Location or Experience Store.