I just bought the 2020 version of Roku Ultra to get Dolby Atmos. I can't seem to get it working with Disney+ or Vudu.
I have audio set to 'pass through' and it's always dolby digital.
If i set audio to 'auto detect' then everything says it's in atmos. Even when the movie doesn't have atmos. This makes me think that the roku is converting dolby digital to atmos.
I watched 1 movie with audio set to 'auto detect' and the sound kept going out every few minutes. So i turned that off and have stayed on 'pass through'