Doesn’t matter. It is being kept up-to-date.
You need to copy the metadata from the old location first!
And a common mistake is failing to stop the plex server while doing that.
Which will result in a damaged/invalid database file being copied. Which then can make the impression that there is nothing in there at all.
So, please go back and repeat the steps carefully.
Actually, this can already have caused the database file to get corrupted.
The solution is to restore one of the backup copies of this file.
https://support.plex.tv/articles/202485658-restore-a-database-backed-up-via-scheduled-tasks/
