[SiDevesh]

I use kdeconnect extensively and it's by far the best solution I have seen. Not only does it allow for sending files but you can even browse the storage on your phone from your computer wirelessly, plus it does notifications syncing, remote commands and a whole lot more. It's actually available now for linux as well as mac and windows and runs great.

[dTal]

+1 for KDE Connect. Really feels like living in the future (that is, the future that should have arrived 10 years ago).

The really cool thing is it's peer-to-peer - if you have multiple desktops running KDE Connect, they can all send files to each other!

Not great for sharing files with "random people" though.