transferring music to SSD

You don't own the music on your Tidal playlists,  therefore, you can't transfer to internal storage.

I don't know the specific legislation, but I don't see how recording music you don't own would be legal. I see apps that will record streams, but I doubt these apps can be loaded on any music dedicated streamer, using a general service computer as streamer means the apps could be loaded. As for the ability for the streaming service to detect the recording app, I don't know. Anyone with experience here? Can't imagine the major streaming apps like Tidal, Qobuz, Spotify,etc allowing this.

Ugh. this makes sense, people have been recording music they didn't own for decades. Still see the monetary issue from the perspective of streaming services, they're not in the business of giving away music.