I am trying to sort the USB MIDI connection in C12

I have a MOTU M4 interface that has MIDI inputs on the interface. But I (instead of using the MIDI port on the M4) want to use the USB MIDI input on my PC DAW. I just realized that the MIDI Port Setup dialog is very different than it was in C11. What’s odd here is that in the MIDI setup window, the only MIDI connection I can see is the MIDI input port- not the USB MIDI connection. Can anybody explain to me how to have the USB MIDI connection show up in C12 when my interface has a physical MIDI input? In advance, I’m sure I’m doing something wrong…