I think this works for you because after attaching your external drive to the Shield TV, you formatted. This way Plex can read this drive as “Adopted Storage” and it works (I think multiple people confirmed that having external drive formatted as Adopted Storage works, so that makes sense).
I think people who have their external drives attached to the Shield TV not as “Adopted Storage” are still having the problem with their drive being not found by the Plex.
For example I do not want my external drive to be formatted as “Adopted Storage” because I want to have the ability to disconnect it whenever I want and connect it directly to PC/Mac.
So for me the Plex is still not working and I also cannot write anything to the external drive connected to the Shield TV by accessing it from MacOS.
