I needed to send a big file to another technically competent adult

there are many ways to do this that I have access to, but I just tried a way I had never tried before, magic wormhole

https://magic-wormhole.readthedocs.io/en/latest/

It goes like this: I already have choco installed on my computer (very like brew for Mac Os)

so I installed magic wormhole with a choco install magic-wormhole

then, I found the file I wanted to send and set up a wormhole send file.zip

Wormhole code is: 11-virginia-shamrock
On the other computer, please run:

wormhole receive 11-virginia-shamrock

and the other computer installed wormhole, typed that in, and the file was transferred

magic

neat!