Try the photos app. They should be there and re-download them back to the gallery. This sounds like a software bug. You might want to file an error report.
Do you have One UI 8? Sometimes UI Updates can cause bugs.
No. Can't see them with the Photos app either. Took photos, videos, and screenshot. Sometimes they were there viewable in gallery (and Photos) Sometimes they weren't. If they weren't visible you couldn't edit them it would say "file not supported" or there's an "i".Then today (well, last night), even some of the ones that were visible and were editable started disappearing. I've now lost almost 3 days of photos. There's info indicating that something is there - it shows the number of kb or mb, but there's no image. Just an exclamation mark.
I may have stopped the disappearing- pictures from the last hour are still there, but only time will tell.
But what's to say it won't stop disappearing them again?
