Crazily, they also have something that looks just like it inside the either the Docs or Drive app, but it doesn't have the same chat history as the one under GM

Crazily, they also have something that looks just like it inside the either the Docs or Drive app, but it doesn't have the same chat history as the one under GMail! I dismissed a notification with photos from my wife and then had a hard time figuring out where that conversation was, because it seemed like it would be chat but wasn't.