Thank you Gordon001 (clicked on 'thank you').
I have been circonspect when came the time of emulated layout
MTP is slow on my side, and UMS was really easy to use.
My main concern is i'm not able to make DriveDroid working. I think it was the lack of UMS, but it seems i'm wrong, because DriveDroid is implementing is own layer on its media img/iso. Do you have experience on DriveDroid ? (CM10.2 for me).