I'm having a problem with the DIY kits in the VAB. When I R click on them I don't have an option to load a craft. All i get are options regarding docking acquire force, staging, crossfeed... but nothing about loading a ship. Any thoughts??? Am I just missing something obvious?
This is on the latest version of KSP (1.8.1) and the newest version of GC. I also have MKS and Kerbal Engineer installed.
Thanks.