Stock Car Preview While Tuned

Sorry if this topic already exists, maybe I used the wrong search keywords.

So I visually and engine tuned my car and wanted to sell it in the auctionhouse but once listed it shows the stock car with the applied paintjob, neither the lowered suspension, rims or spoilers.

What am I missing?

(sorry for my english, I am german)

it’s bug of FH, some managed a work around, something about deleting the default livery or something like that. good luck.