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.
From the filter menu
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 a small animation will run on the filter button.
The current status of the sync is also displayed in each provider cards.
From the Manage media providers settings page
Press the 3 dots button of the media provider then select Sync. (This always start a full sync).