Plex Media Server Nonfunctional After Migrating Server Folder on old Windows machine

Plex Media Server NAS & Devices
4

You missed an extremely important part of the procedure

  1. Did you give “PlexMediaServer” FULL CONTROL of the Plex shared folder
    – AND “Apply to this folder, sub-folders and files” ?

  2. Did you previously “Uninstall & Erase” the prior DSM 7 installation ?
    (It will not migrate / import on top of an existing valid installation)

Assuming you have everything in the Plex shared folder,

  1. Uninstall and Erase (the 3rd package center menu option) the installed DSM package
  2. Follow these instructions (same as given previously with more details)