Hi,

         I have had an Arc for a while. I recently purchased the LG Oled G3. I also have an AppleTv. When I connect the Apple TV to the TV and play a Dolby Vision & Atmos movie and check the Sonos app, look at the Arc all I see is HDMI. 
 

I this correct? How can I see if the Arc is receiving an Atmos signal?

Thanks,

John