Google made a change a while ago that disabled some apps from having hidden folders, but you can just get an old version of Simple Gallery from F-Droid from before that change so you can still use hidden folders for your pictures and videos of… nature ':D
Google made a change a while ago that disabled some apps from having hidden folders, but you can just get an old version of Simple Gallery from F-Droid from before that change so you can still use hidden folders for your pictures and videos of… nature ':D