I have added ( XR5 UCGO Cargo Platform for Orbiter 2010 P1 Version 2.0 ) to my orbiter install.I can get the racks to load in the cargo bay of the XR5,but for some reason I can't load any UCGO cargo to load into the racks.I have tried the usage keys in the pdf as labeled but no cargo appears. How do I load cargo? Thank you for your help in advance.