Hi, I have a 2016 MacBook, and want to use this machine for playing my iTunes library (USB sound card + external HD/hard drive). I bought Apple's USB/USBc/HDMI-adapter, but if I connect an external HD to the USBc adapter port nothing happens. I have to connect the HD directly into the MacBook's USBc port, for my MacBook to find the HD. Can anyone confirm if this is a limitation of the USBc AV multi-adapter, or do I have a faulty unit? If it's the former, then it's ridiculous that such an expensive adapter has a USBc connection only for power, not data. Thanks.