Using FileCast is as easy and straightforward as it can be. Just start the Application, select the file or directory you want to share, scan the QR code (or copy&paste the url below it) and download through the webbrowser of your choice.
By default, FileCast will share the directory it was started in. This can be overriden by passing a file-/directoryname as the first argument on the command line (only the .jar version).
Furthermore, a file can be selected by via copy&paste from the OS file browser.