There's a tool, whose name I forget, which is included in Kali NetHunter to do just that. It does whatever trickery is needed to present the phone/tablet as a bootable thumb drive. It requires root and, to my dismay when I needed it, I never owned a device that was rootable to fully use NetHunter. It could do a lot of other cool stuff via USB too; phone as a Bad USB, Rubber Ducky, automated Windows login bypasses, etc.