Halo 4 Custom map transfer to Xbox One MCC

I know I can’t be the only person with this sort of issue; I have 60+ Halo 4 custom maps on the original game I have been trying to transfer to MCC on Xbox one. The frustrating thing is apparently there was a one time shared files transfer quite a bit ago that I didn’t know about. A few of my old maps made it onto MCC that were already in file share from my 360, so I know it should be possible. Is there anything I can do here ? I’ve just spent too much time over the years making all these maps to give up on the transfer.

Really would appreciate any suggestions on this

https://youtu.be/W3YBpPw8k_8
I trying to make it work right now