The latest mobile app on Android has a feature to backup the camera folder. But, it does not use a QR code, instead it sends you an expiring link via email. At the location of that link you are then provided with a link that starts with: "btsync://link.getsync.com/..." The GUI for btsync does not know to catch this link.
Immediately after syncing on Android, BittorrentSync should perform a "media scan". This would allow for viewing and playing media files that have been synced more easily. This would make moving audio files to my phone much easier, no need to attach a cable and mount the SD card.