I have tried to access my media after quite a long break and by each of my media folders there is the orange triangle with explanation mark and the message Server is currently unavailable. What do I need to do to get my access back?
Please shut down and restart your NAS device. Then let it sit for a few minutes.
If that doesn’t help, try the procedure #15 from here: Synology FAQ - Questions, Answers, and How-To's
You might want to update the Plex server software on your NAS. It appears you are using a quite old one. Use a downloaded installer from plex.tv
Be sure to select the correct version for your NAS’s version of DSM. https://www.plex.tv/media-server-downloads/?cat=nas&plat=synology-dsm72#plex-media-server
