Installing Plex on My Cloud 3TB

My Cloud OS 3 Personal & Network Attached Storage My Cloud
1

Is it possible to install a plex server on a My Cloud 3TB?

2

Simple answer: No.

Longer answer: It is possible, but it is not supported by Plex, and the MyCloud does not have the performance to support Plex, so it’s not worth the trouble.

https://community.wd.com/search?q=plex%20category%3A105

3

Not sure what your requirements are, but look into Kodi to see if it works for you.
I host all my media files on the NAS, all my clients are Kodi. LAN only.