How to upload/download video from/to mobile


I know how to make WWW calls and I used it a lot to send string or texture and download textures or get string from a server on both Android and iOS devices.

What I’m asking is:
Is it possible to UPLOAD a VIDEO to a server FROM Android or iOS device? And is it possible to DOWNLOAD videos FROM the server?

Any luck with this stuff? really curious about file sharing in a game!