Spotify not recognizing iPhone 6 under devices

[Eitte]

I recently upgraded from an iPhone 4 to an iPhone 6. All is well and good until I noticed that my new iPhone 6 can't play local files anymore (I am a Premium user). Spotify also isn't listing my phone under "Devices" which means I can't even sync it. However, I've noticed that any songs I add to any of my playlist on either phone or computer still shows up on all of my devices like it's supposed to... just not the local files.

I've tried the firewall bypass solution, reseting my router/modem, uninstalling and reinstalling Spotify on both my computer and phone. I've also tried to connect via USB. Both phone and my computer are on the same wifi connection... so what gives?