Sounds impossible. I guess, when attached via USB, all storage media is unmounted by the M92, so that the OS of the attached PC can mount the storage. Multiple OSs trying to manage the same storage doesn't sound good to me
But what might be possible is something like network sharing, maybe over a wifi connection. I don't know the USB protocol but maybe this kind of sharing can also be immitated via an USB connection. To be honest, I have never seen anything like that before...