Hello there!
I am organizing my media library for PMS and would like to get some help from community. Most of my library contains Blu-ray rips from the disks that I have bought for last decade. I simply ripped in the MKV format without any encoding or editing.
The new agent/scanner is a consolidation of metadata from multi sources so your never picking one or the other. Those tags are only used for matching so just pick one.
Do not install the version of Plex in Synology Package Center. It is outdated. Download the current version from Plex (link at bottom of page), and perform a manual installation.