Sickrage doesn't show folders

Sorry for the Noob question, I am a beginner. I searched the forums, but could not find a solution.

I have always used Sickbeard. Not for downloading, only for renaming episodes afterwards. Since a few days this has stopped working, so I started looking for an alternative and ended up here. Sickrage probably has the same problem, as it is probably due to https://thetvdb.com/ changing its website, but Sickbeard is no longer being developed I think and Sickrage is.

I was able to install it on Windows, but I cannot get my episodes to show. They are on a Synology NAS, but it is an older model and it was using to many resources, so I uninstalled the Synology package and installed the Windows version on my desktop in stead.

When I go to Manage Directories, I only see local drives . I have mounted \\Synology\TV-Series as Z:, but I only see C:\ through F:\. I am able to add Z:\ manually, UNC path names (\\Synology\TV-Series) are not accepted, but this was the same in Sickbeard.

If I go to addShows/existingShows I see the Z:\ drive, but it is not showing any folders. Each show is in a separate folder, all episodes are in that single folder. As Sickbeard could see all folders, I don’t think it is a Synology problem. So what am I doing wrong?

Sickbeard is of course no longer running, both use the same address (http://localhost:8081)

Any idea how to scan a share \server\folder or network drive Z:\ ?