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NEW INFO In an effort to eliminate Jellyfin server transcoding (though it says it's playing direct) and the WebOS player, I copied all of the relevant files to an SSD drive, plugged them into my LG TV's USB port, and... Same results. 1917 won't play Atmos (no sound at all) but all of my Atmos demo'...

As a newbie, I probably can't help, but I have a question:
What steaming service are you running on your NAS (i.e. "Plex", "Jellyfin", etc.)?
I am familiar with Jellyfin, and might be able to assist.

The random dolby-audiosphere-lossless demo file I found on the internet has two audio tracks in it. One is TrueHD with Atmos the other is a E-AC-3 with Atmos. Which track was your setup playing? It is my understanding that E-AC-3 with Atmos is more commonly supported than TrueHD with Atmos. I inten...

MediaInfo can show you a lot of details about your .mkv files. While clearly a wonderful tool, I wish I understood what it was telling me :? Here is what I got back: 1917 General Unique ID : 66961475598152715881192229847042403745 (0x32604FA415AE9428D568779B2434ADA1) Complete name : C:\MKV Temp\1917...

NEW INFO POSTED BELOW Somewhat briefly: - Using Jellyfin player on LG TV with a Vizio Atmos soundbar. - Atmos MKV's demo's play perfectly ("dolby-core-universe-lossless", "dolby-audiosphere-lossless", "dolby-atmos-test-tones-5.1.2", and more). - Playing these MKV demo'...