Wont save aero and appearance parts to my designs

after I add aero and appearance parts and paint and logo to car , it wont save front and rear bumper skirts hood or wheels to my designs.HELP

It doesn’t for anyone, its a fix that hasn’t happened :frowning:
Bit annoying for sure. If want to make sure correct build is used on a paint just add it to tunes as a shared file (with build only in description)