Manual analyze music doesn't seem to be working at all. No loudness/soundprint data. (except for new files that are added)

[ChuckPa]

May I recommend this to read?

Installation & Setup of Plex Media Server on Synology

Installation and Setup of Plex Media Server on Synology This How-To is in multiple parts to make it easier to find whichever specific step you’re looking for. If you’re new to Plex then reading this thread in sequence is probably the best approach. This will show you how to install Plex on your Synology and then suggest a couple ways you can organize your media. Please remember, You’re always free to do it any way which makes sense to you. We only ask you take the common pitfalls into con…

Please use this guide to migrate your media out of the Plex share before you remove it as part of the cleanup