How do u open cargo doors on your plane???

i think it depends on if it is designed to i know that you can open the doors by shift-e and 1/2/3/4 but i am not sure if it works for cargo doors

You know i try that while pressing shft+E and number but it only opens up the panels

What ya do is press Shift + E but then let go of the Shift + E THEN press a button and it will open the doors. Note: Shift + E without a number opens the main door, the rest are cargo and emergency.