Cant find any files

I just built a new PC with Windows 10 OS, reinstalled Plex Server, (server side works fine)shared movie files but RPi2 doesn’t show any shared files. Any help would be appreciated as I’m not that familiar with setting these up.
Cheers Al

First, make sure you get the basic concepts right:

The Plex Server uses libraries to locate and distribute it’s media https://support.plex.tv/hc/en-us/articles/200288926-Creating-Libraries

Second, Rasplex needs to sign in to plex, to find out which libraries you have.

Then, you will see the libraries on your Plex server from your Rasplex and can select which one to play. Also, make sure you follow the naming instructions for media, if some media is not found by Plex: https://support.plex.tv/hc/en-us/categories/200028098-Media-Preparation