we recorded ourselves with another couple, who keeps the file

first time we did this, mutual agreement, all four on board. one phone propped on a shelf, recorded the whole thing about 40 mins. now were home and the other couple wants a copy. which fine we agreed to it but i dont know the etiquette here. do they get the raw file. do we both delete after watching. do we keep ours and they keep theirs which is two copies floating around now. theres no LS code i can find on this... we trust them but trust is a thing that erodes if someone leaves their phone unlocked at the wrong moment. how do you lot handle the file logistics when its a four way recording