I have been getting this strange pop up image, white background and blue outlines of speech bubbles and a person standing in front of them with their back to us, with a message below saying "once you start a new conversation, you’ll see it listed here" which is on my screen for half a second then disappears. Sometimes I won’t see it for a day or two, sometimes it pops up 3 times in 1 day. I have a Samsung Galaxy S7 and not sure what the image is from. When I go to open Google Messages it will randomly pop up. It is not an ad or a link but some kind of notification. Not sure if it’s some 3rd party app or hack???