Samsung doesn't write the app so back to google product forums and hope they will confirm. Remember the smart TV is like a Dell computer. For apps not from Dell or Samsung you may not get a straight answer from the product maker.
Has anyone else experienced Samsung's YouTube app restricting resolution to 1080p, even on 4K hdr videos?
I played an hdr video from the dedicated 4K section on the app, but the video stats never show the resolution moving above 1920x1080p.
Don't believe my internet connection is the issue, since the amazon app streams in 4K hdr easily.