I’m not seeing a way to integrate with Spotify on the desktop version. is that not available?
No, we have no Spotify intagtion for VOX on OS X.
Without official Spotify VOX integration, using a Spotify downloader Mac or Windows to download songs from Spotify to the local computer is a helpful method. After downloading Spotify music to local files, you can add Spotify files to VOX or any other apps for offline integration on desktop.