How show custom body on Livery Share thumbnails?

I noticed in Horizon 3 and 4 there are a lot of people sharing their paintjobs on custom body setups with differ rims, spoilers, etc.
How do I get my thumbnail to also show my custom body setup too so I can show how the paintjob is meant to be seen?

my car

Try looking at this;

I checked it out and followed the process after deleting the old save but still can’t seem to get it to save with the wide body… Not sure what I’m doing wrong.

I’m no expert to be fair - Midnyte Dubh is a good lad often found in the painters section. If you have a question, try posting in his thread or sending a PM. Pretty sure he’ll try and help you figure it out.