Today there were widespread plex issues. Since that has happened, when adding new files to my library, they never appear on the server. I have tried adding to multiple different folders with multiple different files with no result.
I’m not sure if it’s a residual issue from the downtime today, or if there’s something bigger going on.
I had the same issue on my iMac running macOS 10.14.6 - PMS Version 1.19.5.3112
Toggling the ‘Scan my library automatically’ button did nothing. As the only media I have added to my library recently is music I went to ‘Music’ > ‘Edit Music’ > ‘Advanced’ > ‘Scanner’, then changed ‘Plex Music’ to ‘Plex Music Scanner’. New tracks and albums are now being updated.