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The Distribution of Users’ Computer Skills: Worse Than You Think (2016)
(www.nngroup.com)
This is a most excellent place for technology news and articles.
There's KDE Connect if they're on the same network. You could also use Dropbox or something, but honestly Discord works fine
The only problem I see with KDE Connect is that you need to pair the devices. Works great if both are yours, but probably its not something you want leave with the default settings if its shared with someone else.
Miniserve is a program for computers. Though you can run it in termux. It just opens a tiny server instance for file sharing, you can download/upload files to a directory directory. Will also show QR for the link.