Sometimes even in Conversations-to-Conversations I see symptoms like receiver
says 99% done, sender says 100% done, hangs like that and then file transfer
fails.
I was having this issue fairly reliably between my emulator and my test device.
Adding this close caused the transfer to succeed 100% of the time. I'm not sure
why the receiver didn't read all the data properly without the close, but this
fixes it.