I've built something like this on macOS using a simple web server. As soon as a screenshot hits the desktop (and either Ctrl or Shift is held) the file is uploa

I've built something like this on macOS using a simple web server. As soon as a screenshot hits the desktop (and either Ctrl or Shift is held) the file is uploaded to the server and the public URL is copied to the clipboard. It's basically just a folder watcher and a shell script.