I'm sort of surprised Google and Apple don't have a "private mode" camera option. Some way to mark a photo or the next X minutes, and those photos won't show up

I'm sort of surprised Google and Apple don't have a "private mode" camera option. Some way to mark a photo or the next X minutes, and those photos won't show up in the default camera roll. Maybe they trigger a second dialog before sharing. Just to try to minimise accidents.