Update.
I have this pinned down to “Last working” and “First failing” versions using the Picard (TNG) video clip.
The engineer has all this info now and the test clip (all in one lump)
For those wanting to take matters to manual mode, I’ve discovered PlexForAndroid-8.19.4.26517-f35a541c-Arm64v8aGooglePlayStdExo.apk works for me on this Shield Pro 2019.
I don’t advise remaining there but it will allow confirmation of “Last working”
