I have a Huawei Mate S with Android 6.
After updating my MacBook Pro 13" Retina to Sierra I noticed that Android File Transfer correctly opens up when I plug the phone into the USB, but the window remains empty, as if the device isn't containing any file.
I've tried everything, switched USB mode to MTP, activated developer options, but still no joy.
The USB cable is ok, it is the original Huawei provided with the phone. I'm figuring out some permission problems, but I can't go any further in this direction.
Does anyone have the same problem?