@Jay_Brown yes, I was also “fooled” by Roon’s Signal Path into thinking that it enables my Shield to play in 192 to AVR.
After checking the AVR’s Audio/Video details, I realized it’s only in PCM 48.
It seems like we need something like the UAPP app mentioned in this thread to bypass the Android limitation, and then have Roon integrate with that app.
Personally, I think the chances that Roon will do this is low, given how lack of responses they are on other requests. Especially when latest update it seems they are spending more time on developing car interface.
In any case, I am still writing here to make it known that Nvidia Shield is a piece of fantastic hardware with Atmos and multichannel support, and if Roon can support it directly, it would mean not having to buy additional endpoints.