See below for instructions on how to cast to TV.
1. Turn on your TV.
2. Make sure your TV / casting device and smartphone are connected to the same Wi-Fi network.
3. Tap the casting icon in the upper right corner after tapping a photo/video you want to cast.
4. Select your TV.
(Chromecast / Google TV device)
5. After connecting, the photo/video will be displayed on your TV.
6. To stop casting, tap the casting icon > Stop Casting.
*Please refer to Google Help for instructions on how to set up Chromecast or Chromecast with Google TV.
https://support.google.com/chromecast/answer/2998456
https://support.google.com/chromecast/answer/10109990
If you are having trouble casting to your TV, please see the help article below:
I can’t cast to my TV.