Is anyone here familiar with using DoubleDouble? It seems like you can download from a bunch of services, but you can only search from Spotify or Apple. Is that correct?

I am trying to track down an album in FLAC format that is not on Spotify or iTunes, but it is on Amazon Music, yet DoubleDouble can’t seem to find it even if I paste in a direct link to the album. Am I doing something wrong, or is that just how it works?