Fail to load an external image.

I have been try to make my make my Pages more portable, in particular, use textures from another site. When I do this I get errors like:

RuntimeError: Failed to load external image:

The referenced gltf line of code is:

“uri”: “

If I do this again I might have a different failed texture load. On the local server all is well however the referenced code is:

“uri”: “/resources/vcity/3Dmodels/textures/blank.png”

Just a wild guess, how about you use JS to preload all the pictures first before start Cesium?