I would like to draw you attention to a really cool, instant, distributed, secure file sharing technology. For situations where you quickly just want to sent a file to somebody without using Dropbox, Drive, ...
Magic Wormhole
https://magic-wormhole.readthedocs.io/en/latest/
If you just want to quickly try it out, there's a GUI app here:
https://github.com/Jacalz/wormhole-gui/releases
