1. Register on PARTcommunity.com

2. Upload your 3D model on 3D SHARE - PARTcloud.net

3. Choose "Challenges" category (no need to choose subcategory). First you upload files, then renders (Upload Image).

4. Choose the right license depending on your choice.

5. Done. You can upload as many 3D models as you wish for the Weekly Challenge and good luck!