How do you transfer files to/from your WP via Wi-Fi?

I mean Wi-Fi file transfer. WP 8.0 and even 8.1 doesn't seem to have this feature built in. I tried some apps that allow wireless file transfer from PC to a Windows Phone via HTTP. But the procedure is a little too complex and files stay in local app storage. Also I couldn't find an easy way to transfer files the other way around i.e. from PC to a WP via Wi-Fi.

Please let me know if there is a simple, direct way to send files to and from a WP device using Wi-Fi.