Thanks for your post.
The next time your son wants to show the Great British Bake Off judges what a whiz he is with a mixing bowl, suggest that he uploads his zip file here:
https://1fichier.com/
(The maximum file size permitted is 50Gb, so that's 20,000 times as big as Gmail's server can handle. That's an entire cake shop full of pictures!).
He'll then be given a link which he can send to the intended recipient of the file, so that they can download it.
(You can ignore the bit about 'prices'; the basic service is free).