Could not create PlexData share

Sure, let me elaborate.

  1. PMSLibShare (which creates the pseudo shared folder “Plex”) is a static operation.
  2. PlexData is a dynamic one. It is dynamic in that as you “Migrate To” (in App Center), the linkage to your Plex data is adjusted automatically when it starts again.
  3. There is no advantage to creating it on a SSD. There is far greater advantage to “migrate to” (migrating your PMS installation) move the entire Plex install to the SSD.
  4. There is no real data in PlexData unless you place something there. I only create a 4KB symbolic link to (using QPKG syntax) ${QPKG_DIR}/Library/Plex Media Server. Most of us will see this as /share/CACHEDEVx_DATA/.qpkg/PlexMediaServer/Library/Plex Media Server when looking at it in the shell.
  5. SMB access (if granted by the NAS admin) works very well. QNAP’s CIFS server follows the links transparently. From a Windows client, making a ZIP backup of “Plex Media Server” onto the Windows machine works perfect

May I suggest going through the FAQ I created?