Kent,
To repeat my goal is to record on the melody or soloist track.
Here is my procedure in BB 2016 (as noted earlier 2018 won’t work for me).
Prior to opening BB I plug in Oxygen 8 via usb and it powers up.
Following your instructions, when I get to “select Ports/Instruments”,
The top box MIDI in is blank and the pull down arrow also shows blank.
Ernie