I have a Nexus 7 tablet with only 16gb of onboard storage and no SD Card slot. As such, I rooted my tablet with a kernel that enables OTG connections for USB drives. The drive shows up just fine in my settings, and I am able to access the drive from my tablet.  However, I cannot download my Spotify songs onto it. I also do not have data, and as such, I can't just stream the music when I'm using the tablet in my car. I obviously do have premium, and only my phone has the songs downloaded to it. As such I have two questions:

1) If anyone has the same setup, do you know if there is a way to download what files I can to my device and then move them onto my USB drive? 

2) Since I have all of my songs downloaded on my phone, is there a way to stream the songs off of my phone via Bluetooth or some other solution?