Hi there, Letstrit. I've looked at the files and after some tinkering, fix is to rename the new custom UV name from "UVMap.001" to the default "UVMap". It seems that the Blender add-on expects for a UV to be named the default way "UVMap". It uses this specific one when exporting. And if no UV is named that way, it skips and the mesh disappears. Hope this helps