I understand that I bring resources back to the floating collection container to offload - I've done that plenty.
What I mean is, if I press "Return to Nimbatus" at the end of the mission, then I'd expect my drone to be returned and its contents unloaded.
Instead, it seems my FOCUS is returned to the Nimbatus, but the drone is abandoned wherever it is, and any contents it had in its storage holds are lost.
This is not at all obvious - I thought everything was "returning" - including the contents of my drone's storage holds.
Now that I've gotten the Factory Block, I could see how auto-emptying unreturned drones could be exploited - just make an army of drones, spam the planet, and then "Return" and you'd collect all their contents.
I guess it should be made more clear that drone contents are NOT retained when you "Return".