I have followed your advice given above and here Plex Media Server security changes for Synology users and now I have a problem with my optimised versions. Plex does not recognise the optimised versions as such in the new folder structure. Plex marks them as ‘Original’ copies. That means Plex will not correctly automatically select them for playback when needed. It also means when I create a new automatic optimisation task for that library Plex wants to re-optimise everything!
I said it was a deal breaker. I asked you three times about it and you ignored it. You have stitched me up.
