You kinda can, but only if you drag the track from the playing deck. You cannot open a Spotify list in Serato and drag tracks to local crates. After getting in touch with support, they said that this Serato does not support Spotify tracks in crates (although you can do this in this weird way). Unsure what's up, but I was really looking forward to that with the release of Serato 4, since it's a game-changer for (especially) open-format DJs.