pre-Synology DSM7 versus post-Synology DSM7 xml editing options

[ed]

Yes, with DSM7 things have changed a lot. Instead of having Plex shared folder, now you have a Plex install on the backend Linux system (in a way). You can use parts of this guide to figure out a location of Plex files https://www.youtube.com/watch?v=UyNEwaRv8eA
You may then change things you want once you know where all the files live.

I hope this helps.