I have a Samsung smart TV - the streaming services are connected to the internet via WiFi. When I use an app on the Samsung tv ( to Netflix for example) I’m able to get 5.1 surround sound. When I access Netflix thru the Roku stick (viewing the same movie) I can only get 2 speaker stereo. I’ve connected the Roku to HDMI/ARC, and have all the audio settings set to “auto”. Any ideas? Thx.