Hi Rich, This is only regarding texture maps - not shaders per se. You need to save all textures internally if you want to make it easy. However, that makes file size larger if you reuse the same texture on separate parts. You can also save textures externally, but you'll need the textures next to the model in the same directory so the relative file path remains the same. This creates smaller deliverable files but is more open to user/buyer error. Mark