DLNA server not including content on USB?

This might be explained somewhere else but I can’t really find any information about it so here goes. The DLNA server in the hub is only showing content from the internal HD and nothing from any attached USB devices. Is this really how it is supposed to work? I have movies on the internal drive, TV-series on one USB-drive and HD-movies on the other.

Is there any way for me to make all content being available via DLNA to other devices or should I just go for a better solution than the WD TV Live Hub?

Thanks in advance

Go into the Twonky configuration webpage and add the USB drive to the content source.

Thanks, I knew I had missed something simple yet vital. Cheers!