Symfonium tries to automatically sync your data when there’s changes, unfortunately not everything can be detected like metadata updates or playlist updates.
You can force a sync for a media provider at any time.
Press the filter menu then press the Sync button for the provider you want to update. Some providers support differential sync, to force a full sync long press the Sync button.
If a sync is running an indicator will be present in the button.
Press the 3 dots button of the media provider then select Sync. (This always start a full sync).