Air play not working from iphone 11 promax to macbook air

Hi can anyone help? I was using airplay fine to transfer videos and photos to my macbook air from my iphone 11 pro, but the last three times I have tried it has not worked, just sits there with waiting, now telling me online that both macbook and iphone need to be on same network but i use my iphone hotspot for my macbook for internet as I am not near a wifi area can anyone poffer suggestions? its annoying having to email videos to myself all the time now