DSM Direct Migration from 6.4.2 to 7.2.2 - Plex Server / Media not migrating to 7

The migration only occurs when PlexMediaServer shared folder is empty
–AND–
System Internal User has FULL CONTROL (not just RW) of the Plex shared folder for All Files and Folders

Have you looked at this?

I am the author of it all. Please don’t hesitate to ask questions.
You can migrate all of DSM 6 → 7 without any loss.