Having Dolby Atmos issue (TrueHD), despite having a TrueHD capable receiver (Marantz SR7010) (Dolby Atmos passthrough works flawlessly with OpenPHT on Odroid C2). Surround sound is enabled and passthrough was enabled when asked for.
The Z11 does not display TrueHD as supported audio streams in audio settings. This results in PLEX transcoding the audio because it thinks the AVR does not support TrueHD.
Strangely enough, if I select the EAC3 audio stream in a dolby atmos demo video, it will passthrough as TrueHD correctly (confirmed by AVR displaying Dolby Atmos as signal source). Any other TrueHD audio stream will result in transcoding them by plex because it thinks the AVR does not support TrueHD.
I have not tried with others apps other than Plex, but my guess is that it won't work as well since TrueHD is not even listed in supported formats (although it should).