denis, do you have bedding on the mattress when trying to fold up? that would make it tougher to snap.
we do ours like Chuck except for we fold the smaller section over the hoop and wrap the side straps one time around the sides of hoop before snapping down. we do put something around the hoop's black thing that the pole goes into so it doesn't abrade the top of the mattress.
we don't have anything on the mattress when doing this.