@breversa
Tagging using inline editing in the playlist for files outside the library was broken, I've just fixed it.
If you are on linux you can try the latest from https://builds.strawberrymusicplayer.org/

@uberblatt
There is, if you go to tools / "Update changed collection folders"

@appson
It was an issue with the flatpak runtime, it should be fixed if you do an update.

@Kisequé
It doesn't support multi-tags. It might be something we can implement at some point, but it's a huge job.

@materpris23
The desktop file has been renamed since the previous reply, normally should be /usr/share/applications/org.strawberrymusicplayer.strawberry.desktop

Maybe there is an issue with Tidal authentication when using flatpak, try a native package.

@Devilishly_Jaded
You can't use a client ID from https://developer.tidal.com/dashboard, if that's what you've tried, that's not compatible. You need to use a client ID from a registered application that Tidal allow to get stream URL's without unencrypted.

Just tested and it seems to be working again in Linux Mint.