Hi @DDBE Are the photos definitely not in My files? If missing firstly try the recycle Bin to see if they can be restored. If not go to Settings-Apps- Gallery -Storage- Clear Cache. Restart device and see if that makes a difference. However can they not be accessed anywhere else such as One Drive,Google photos or an SD card /External storage?
As a general point I would advise that Members have back up options.
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.
My Device- S21 Ultra 5G ( SM-998B/DS ) CSC= BTU , 12GB/256GB
One Ui 5.0,Android 13 .