I use Plex for media management and I host my folders on a WD MyCloud PR2100 and recently changed my network (rewiring let me move to a Cat6 wired network from a new router). To get the NAS to show up on the network I did a soft reset of the MyCloudPR2100 (4 second press of the reset button). I can now map my folders on my PC with no issues so all the files are there, but the folders are not showing up when I try to add the folder to a library in Plex.
They worked fine on the old network, no clue what I’ve done!