I have ATV in my new Bravia X900F and I want to make sure I'm watching movies in UHD on Google Play Movies. The YouTube app has a quality switcher so I know I'm in 4K, but I can't find one in the GPM app.

Worst case, I guess I can stick to YouTube or cast from my phone as I believe this TV has a Chromacast Ultra built in, but I'd prefer to use the Play Movies app if possible.