Yet another bug I’ve found with Forza 7.
Downloaded a livery for the Jaguar Project 7 Forza Edition. I liked it, but kind of wanted something different, so went to replace it with another after a few races. Go to replace it, the new livery downloads, saves to My Designs and applies to the car. Or at least it claims to. After looking at the car in garage once, the livery is replaced by the old one, and the new design does not appear in the My Designs section.
EDIT: This is on the Xbox One.