And while OTG won't work with a drive, it should work with your phone. At least according to my file explorer on my Note 8 it should. Which is a plus because I transfer everything to the card on my phone. So between Hiby and file transfer it should be a nice setup without ever needing my computer.
I did just tried your suggestion and it works well. Great Idea. My Lumia 950 detects 2 MicroSD cards and I can transfer files from one to another correctly.
So I can move all my music out of the computer to the M1, and from there transfer whatever to the phone. Cool stuff.