Doesnt saving on cooperative

When me and a friend tried to continue the capaign who we have played most early, We noticed the game is not saving. All times we have tried to continue, but the game start from begginning. Anyone with the same issue?

(Coop campaign)

As far as I can remember, no Halo campaign ever saves Checkpoints during Co-Op missions, only solo. You have to complete the whole mission in Co-Op in 1 go.

lol if anyone comes across this thread, co-op campaign actually does allow u to save 3 different checkpoints within the co-op campaign. just do a manual checkpoint save before leaving/exiting the game though. And when u start the game u have to choose the Load option & pick 1 of the 3 saves to load, the resume function doesn’t work which is probably what u were trying to do…that just starts at the beginning iirc. also manual saves aren’t possible if u have score attack on…

if u r an achievement hunter, 2 of the 3 checkpts will probably be occupied by checkpts before Worms Don’t Surf area & Prison Break area before they pop…