Plex doesn't auto-select the ac3 5.1 track. Apple home sharing does on ATV4 as it did on ATV3. I presume it uses the ATV dolby setting to know that with dual audio tracks which one to select. Having to manually set this before playing a film every time is really annoying. I find I sometimes just use home sharing as per ATV3 to avoid the hassle making ATV4+Plex redundant.
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