Have you checked the trash on your Gallery app?
When did you notice these symptoms?
Have you had a software update to your device recently?
Did you back up your device prior to experiencing these symptoms?
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All of mine are gone too. Anything prior to Jan 10. Gone. Over 1k photos. I did not delete them. I ran DiskDigger and was able to find about 100 of them. But the rest have vanished. I turned off Samsung backup because it said it had reached its storage limit. Is that the culprit??