A friend of mine and I both have 830s (both running latest 4.10). Yesterday we thought we would try doing file sharing between devices (since that seemed like a useful feature).
But it didn't work at all...
My friend first set his up to share a route. And I was able to see his device on the discovery screen. But when I clicked it, it spun for a while and then I got an error saying "connection failed" (or something to that extent.
We tried several times but got the same failure each time.