Things that are broken in Debian Stretch- file transfer from Android phone with Bluetooth

File transfer via Bluetooth from an Android phone is currently not working in Stretch. However, I was able to transfer a file today using a workaround.

The solution is to manually start obex and re-pair the phone with the computer. The command is systemctl --user start obex. (Found on stackexchange.com.)

It seems obex isn't auto-started properly. (There's a bug report at Red Hat Bugzilla.)