1. Here's why
1.1. Make sure that your model is close to 0,0,0 in your 3D/CAD software before you import the model in Lumion.
1.2. If the problem persists, something on your PC is most likely preventing Lumion from saving the Imported Model files to Documents/Lumion (VERSION)/Library. Please follow these instructions to resolve the problem:
- Knowledge Base: Why are models missing when you open Lumion demo Scenes?