When an asset is not on the DLS (often called "third-party" or "payware"), you must use external search tools: Rememeber to search the internet for missing KUIDS - Trainz
This requires testing. The wrong substitution will cause "Faulty Dependency" errors or graphical glitches. kuid search trainz
KUID[<authorID>][/<assetID>]
The unique registration number assigned to a content creator . When an asset is not on the DLS