When I open the BIOS the pen drives plugged into the USB3 hub are not listed in the "Boot priority settings", however, if a pen drive is plugged directly into the PC USB3 or USB2 port it appears in the "Boot priority settings".
Once booted into Windows 10 all USB2 and USB3 pen drives in the hub are recognised.

The hub is an "EasyAcc USB 3.0 7 Port Bus-Powered and Self-Powered 2-in-1 Hub ".
The Mother board is a Gigabyte GA-990FXA-UD3. All the latest drivers are installed.

Is it possible for a BIOS to see pen drives plugged into a hub? I am not sure whether I was unlucky in my choice of hub and chose one with the limitation of being blind to the BIOS, or this a normal for all hubs?