TesDisplay can cast video or mirror your phone screen to Tesla's big screen.
Key features:
1. Play video for passengers when you are driving
2. Let you use navigation apps such as Waze, Google Map, Here WeGo, MAPS.ME on Tesla's screen
3. Can mirror various video apps, such as Youtube, Youtube Kids, Tiktok, Netflix(only for iPad with cellular), Twitch, DailyMotion, PBS, PBS Kids, TED Talks, Khan Academy, Plex, Rumble, Vimeo, Zeus, etc. for passengers.
4. Cast video files on your phone to Tesla's screen for passengers
5. Cast Youtube, Tiktok, ESPN, TED Talk, CBC, PBS videos to Tesla's screen for passengers
6. No extra internet traffic

Those features have been verified on Tesla Model 3, Model Y, Model S(late than March 2018), and Model X(late than March 2018).
For vehicles with Tesla MCU1, you can try setting "Decode video by Phone" to get better video quality.