Perhaps that is the problem. But I have not ever been able to get that window to come up. I have watched a youtuber doing it and he has not powered his ship yet. I think I just don't understand what key to press to get that window to come up. I will try again on a container outside the ship.
/edit to add: Thank you, Raventha. You were correct. Not sure I understand why items cannot be stored on the ship before power up but that is the way it is.