I'm an apple fan, so for me I just use "Air Drop". :)
I should probably be using Air Drop more, I use an iPhone and am on a Macbook right now. Half the time I'm on a Windows or Linux machine though.
I use Dropbox because it was easy and I have some folders shared with me from other people, and a NAS at home.
I just so happened to come across this post and wanted to share a neat tool - I also use Air Drop... for my Apple devices. Yea - thats the holdup, right; well theres a really nice tool available on Windows, MacOS, iOS, Android AND Linux that you have to checkout;
LocalSend
https://localsend.org/
It just works - for text, files and media. Very useful and, IMO, better than Air Drop as you can use it on any device.
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