I am having mixed results with Apple 4K using beta. I tried a few episodes of Pluribus and they worked great. Then I tried Foundation and this happened.
Download took 30 minutes, Pluribus only took about 2 minutes.
After download completed, it started up at 0% again, but this time at a good speed. Half way through second download it the progress bar changed from Downloading Video to Downloading Audio and it almost stopped. I waited for it to finish, it took 90 minutes. When I tried to play file, the audio cut out a few minutes in.
I tried multiple episodes of Foundation, same result.
So still not working for me. @Wilson.Wang