When I select my interface in preferences (ur12), there are no longer any inputs

Make sure that you're selecting the ASIO driver in the top drop-down box, then your device's specific drivers in the next drop-down box in the Reaper audio devices menu.

If they're still not showing up, make sure that the device is powered up, plugged in, and shows that a USB connection is established with the computer (should be some sort of USB indicator light on the UR12).
 
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