Did you export as fbx, and what software are you suing for 3d models? if its blender i probably have the solution: When exporting if you have “selected objects” turned on make sure that your mesh is selected in the viewport
Did you export as fbx, and what software are you suing for 3d models? if its blender i probably have the solution: When exporting if you have “selected objects” turned on make sure that your mesh is selected in the viewport