When I click “Sync” on my Subsonic server source, whenever I look at the filters or in Settings it appears the app is constantly syncing with the server (the circle is always spinning). It ran for over 8 hours like that even though the actual syncing seems to have been accomplished in minutes and the log file stopped growing in size.
Join files do not paste the content of the files here! Do not upload them to random website, zip files are allowed.
(They are mandatory, no need to ask if I need them or don’t assume they are not needed for your issue, they are needed.)
You have enabled the option to fetch additional metadata, and your navidrome instance time out on each calls to get them. So at 10 seconds for the timeout for each album and artist this can effectively takes ages And since timeout is a network error Symfonium does not consider this a lack of data but a temporary failure so will retry again at the next sync.
Can you provide the navidrome side logs to see. Does your navidrome server have internet access to gather the data?