- TriLib is not a Model exporter.
- The FBX Importer does not import multiple texture layers yet.  
- The FBX Importer can't load models created before FBX SDK 2012.
- 3MF Beam Lattice format is not supported yet.
- 3MF PBR Specular materials are not supported yet.
- Blend-shape normals and tangents are not imported yet. They are instead, calculated.
- The AssetViewer normals debug view has issues when the model has no normal textures.