I use FP Open 17.08.1. on my FP2. (Recieved it on 14.8.17)
At the beginning I could connect by USB with android file transfer and the dropdown menu.
Since the last update my macbook (Sierra 10.12.6) does not recognize the USB connection as well as the FP2. So there is no dropdown menu anymore. Also charging is not working on the computer, but works easily with power socket.
Now I connect by Bluetooth, but that is so slowly…