With Synology NAS, moving from version 6 to 7.2 on new NAS, will Plex work properly afterwards?

How this works:

  • The Plex shared folder (were all the metadata is)
    – Gets the permissions & ownership changed to the new DSM 7 user “PlexMediaServer”
    – This must occur before or while the Plex (for DSM 7) app is being installed.
    ( we don’t have the same privileges on DSM 7 as we did on DSM 6 so we require the user’s assistance )
  • As the app is installing, it converts the structure and reformats some of the data to work in the DSM 7 environment.
    – Conversion requires about 3 minutes per 1000 media items you have Indexed in Plex.
  1. After the Plex server and metadata are all reconfigured for DSM 7, we update the permissions for the media
    – ( User “Plex” isn’t used in DSM 7. We had to abandon it. We changed to “PlexMediaServer” )

All the info about changing media file permissions is here

Lastly,

You might want to review the FAQ as it’s been updated for DSM 7 (showing both 6 and 7 where appropriate)