DLNA with hub-attached drives

This is probably a bug: while one can attach up to 7 external drives to a MyCloud device through a USB hub, those external drives are not made available to DLNA. The external drives do show up properly as shares on the MyCloud device, but the Media Scan finds no (music, photo, video) files on these drives. DLNA only works when each drive is connected directly (individually) to the MyCloud device. 

It would be preferable if ALL attached drives (attached through a USB hub) could be used for DLNA.