What I mean is, A vehicle that when you go to the Livery Tab says “There is no Liveries”. I go into the the Flags and make sure there is both FLAG_HAS_LIVERY | FLAG_LIVERY after adding a fake [Name]_Sign_1 to the YTD file, the reset. nothing. the same message “There is no liveries”…
you need to make sure the texture name in the YTD follows the exact naming convention the game expects — it needs to be yourmodelname_sign_1 (all lowercase, matching the model name exactly). also the diffuse texture slot in the material inside the YDD needs to actually reference that YTD, and the shader needs to support liveries, it should be using vehicle_livery shader not just the standard vehicle shader.