I have a Samsung Galaxy S21. I received an icon notification on the top bar next to the clock, it was like 3 offset circles or bubbles, I wasn't really familiar with it. When I dragged it down, it was an email- that I'm almost positive was sent to my Gmail. I figured I'd deal with it later, so I just closed it and moved on. Now that I'm checking, it's not in my Gmail or anywhere that I can find. I haven't even been able to identify what the notification was. Any help appreciated.