3D objects appear black when published


I am new to Zapworks and I have a problem when publishing my project.

The 3D objects appear fine with their textures when I am editing in Zapworks studio …

… but when I publish the project, two of my 3D models appear completely black with no texture.
Light is already added to the project so it’s not the issue.

I need help, and would be really grateful if anyone had a solution for this issue.

Thank you !

Add a light ! - 3d objects with standard lighting materials are black till the light hits em. Or choose unlit in the model’s properties.

Note: Be careful with “Unlit materiel” option if you use gltf model because there is an old bug that lead to a crash : Embedded texture crashes app if unlit material is used