Sharing files have been a lot easier thanks to the cloud, at least compared to frantically copying files to a USB stick and passing it around. However, it could still be much easier. Cloud storage and sharing services, by nature, require an Internet connection. Ad hoc networks, including WiFi direct and Bluetooth, aren't exactly easy or fast to get up and running. And NFC just doesn't cut it for large files or bulk transfers. Enter "Copresence", tipped to be an upcoming service from Google that seeks to solve all of that.