To re-link the Dragon OBJ model, navigate to the X-Ray Effect with OBJx composition in After Effects. Then select the layer named "Mantra Objx". Navigate to the Effects Controls panel and you will see the Mantra Objx effect controls. Select the button that says "Select Model". Then navigate to the Mettle X-Ray Effect Project File Folder. Select the folder named "(Footage)" and then select the "dragon" OBJ file. This will load the Dragon model into Mantra Objx.