The DSM 7 Plex Pass versions of Plex Media Server at plex.tv/download are built to work with DSM 7.0-41882. Prior versions may or may not work correctly.
Note that DSM 7 releases are not stable. Synology, without prior notification, changed several things when they released -41882, some of which broke Plex.
Do not install any future DSM 7 updates/betas/etc from Synology without checking the Plex Forums first.
There is no guarantee Plex Media Server will work with future DSM 7 beta releases or that Plex will release an update if things break again.
See DSM 7.0-41882 “Release Candidate” breaks Plex - Do Not Upgrade . Plex has since posted -41882 compatible versions at plex.tv/download, but the note shows some of the issues they are facing with DSM 7.
