I'm trying to play a blue ray backup and I'm just getting stereo even though it has FLAC 5.1 audio. Here are some details / specs: NAS: Synology DS 1019+ File: Skyfall Blue Ray backup that I backed up myself, .mkv, FLAC 5.1 audio Roku Ultra w/Emby app installed Roku connected to receiver via HDMI Roku Audio Mode: Auto (DD+, DTS) Receiver: Denon AVRS730H Receiver connected to LG OLED65B8PUA FWIW, I can stream 5.1 from Netflix via the Roku, so I