Used to be able to hit the Cast button in YouTube or Google photos and throw the content right onto my TV but that option has disappeared from the two GS7 phones in our home.
I have neither a Chromecast app or any Chromecast devices. Before this last update, on both of our s7's, we could just hit the cast button and it would find my tv and display just fine on the big screen. Now that option is gone entirely.