Hey @DPB1982 ,
can you tell us if you are saving your pictures to the internal memory, SD card, or any Cloud storage? If you go to Apps > Samsung (Folder) > My Files > Images, are the pictures present in this location, and have you previously backed up these images using your Samsung Account or any other Cloud storage?
This happened to me just over a week ago. Photos nowhere to be found, including not in the places suggested by the Samsung support people. Fortunately I had mine backed up to Google Photos and had to painstakingly restore 700-ish of them, but twice since then a bunch of them have just disappeared again. I've sent error reports to Samsung but they are still investigating. I'm sorry this happened to you too. Turn on a back-up - probably more than one to be on the safe side - and hopefully they'll find a fix because I don't want to be restoring missing photos on a weekly basis. The photos are the main reason I got this phone too (the GS20).
Me too! 100% of my photos are gone in my gallery. Everything. Including photos staved internally and to my SD card. What is happening?! Please help! I'm so frustrated