Uploading purchased music

Does anyone have tips for getting music purchased on an Android device, for example from Amazon, to the Subsonic server?
Even if it's not via the Subsonic client. That is, other programs that can sync that music, preferably without having to connect a cable. I can use FTP, but really it would be nice to have something automatic.
Even if it's not via the Subsonic client. That is, other programs that can sync that music, preferably without having to connect a cable. I can use FTP, but really it would be nice to have something automatic.