4K on iPad started around beta 3 I think. I have been using it. Its not there every time I watch but is there most of the time so its a real option.
It was there with the last so many beta of 14.0 and the publicly release. However Apple must have reverted back to older code and its no longer working on 14.2 b1 on IPadOS.Are you on a beta? I'm on 14.0.1 and have tried many 4k videos and none have shown an option above 1080p.
The only videos I can get it to work with on my iPhone 11 Pro max are show case videos for HDR and 4K. Completely useless as I'd never watch those videos. I can't get it to work at all with my iPad pro or iPad mini.
YouTube 15.39.4 came out 1 day ago to replace 15.38.2 is still not working to play 4K on iPadOS 14.2 b1
Likely the same with iOS 14.2 b1
Just an update iPadOS 14.2 beta 2 (like beta 1) doesn't allow 4K YouTube (15.39.4). Stay with 14.0.1
Funny I seem to think its the opposite that Apple keeps breaking the support as they release these incremental betas. I know it was working with iPadOS 14.0 then upgraded to 14.2 beta 1 with exact same app version and it is no longer working. That doesn't point to Google in that instance. Probably blame on both sides maybe?Nothing to do with iOS updates, it's all on YouTube's end. They keep enabling it and disabling it randomly (well to us, I suspect they are still doing A/B testing, or just messing with us).