[mr337]

For one off for technical folks on both ends I like the magic-wormhole cli tool. https://github.com/magic-wormhole/magic-wormhole

[factormeta]

Just FYI, Quiet also allows unlimited file transfer size: https://tryquiet.org/

Not saying it is most efficient, but for non tech friends, that may be an option.

[toomim]

And for non-technical folks I use wormhole.io.

[kjkjadksj]

If you are working with technical people might as well just use ftp and be done with it