I just bought nvidia shield tv pro and i thought i will not have any problems with plex but i was wrong. I will try to explaine some ideas which i have.
So download plex from play market and installed it. Go to X-plore file manager - find App Manager/Installed. You will see Plex (it is client) and may be Plex Media Server. If PMS exists - delete it. And install that apk from
fix bug : Plex Media Server 1.25.3.5410 (smb) APK Download by Plex, Inc. - APKMirror
After PMS installation run it and the installer itself will direct you to the steps to install the server.
p.s. sorry for my english
