Why tutorial-video-textures can't run correctly on iPhone and Android?

I tried to run the example on my iPhone and my Android,
but the TV screens were black and did not show the video correctly.
Can anybody help me?

https://playcanvas.com/project/405850/overview/tutorial-video-textures

Works fine on my Samsung S7 with the latest Brave browser. What model of phones and browser versions are you using?

iPhone X Safari (iOS 12.0),and default browser on Meizu ( a chinese cellphone brand, using android)

probably the browaer safari doesnt work well with iframes actually i dont think it works at all on moble but i could be wrong

I don’t have an iPhone I can test with. I would try to connect to the phon browsers to a web devtool and check the console log: