360 Halo games losing support in 2021

I understand having to move on, I get it, but is there a way we can upload our old maps again? The first round they did it, it didn’t grab all the maps I put into my fileshares before the move… and I think one way to ensure good faith would be a way to do that, even if it’s something as simple as a system that allows you to move and convert them to the MCC files with a USB… it’s a big ask, but there are maps I and probably a vast portion of the community would rather not lose. Even if it’s not possible, I just wanted to get the word out there.