Using both usb3 slots, have one usb 2 slot available, but would slow photo saving if I used it for a usb stick. Can’t do without one usb 3 slot because it is for the main camera, asi2600mc pro. The other used for my asi120mm-s.for guiding also a usb 3. One usb 2 slot is for mount control. Why can’t the usb c cable access the sd card? Seems like a dumb situation.