This is why I don’t use Plex.
I went to install it once because I heard it was good. It said the next step of the installer is make a plex online account so I can log in. I looked for the ‘I don’t want online I want local’ option but I didn’t see one. So I uninstalled.
Nowhere did it explain what if any access Plex servers have to my media library (metadata or files), so I said no thanks I’ll just go back to using folders.
Glad to see I made the right choice.
Depends if it has to stay battery powered.
If you’re willing to hardwire it, get a battery eliminator kit like this (get the right one for your device, be careful!) and now instead of a bunch of AA/AAA powered devices you have a bunch of USB powered devices. Get a multi-port USB charger, plug it into a smart plug, and you’re golden.