MacBook Pro USB-C adapter and regular USB devices compatibility
It looks like this particular product (uniHub-C) has its own idea about compliance to USB specifications. The designers seem to cut off the USB 2.0 part of the VIA hub design. First sign is that their marketing blurb doesn't mention support for legacy (HS, FS, LS) devices, which is strange - in marketing, more is merrier. Second, the web page shows some goofy "USB Super-fast" logo, which in no way corresponds to the official USB-IF certification logo,



I suspect you fall for a wrong device.