GLB/GLTF export on mac to external drives won't export images

[heyvern]

I isolated the failure to external volumes on macOS. The same Moho file and glTF export settings produce a complete GLB with textures when exported to the internal drive. When I export to my external drive, Moho creates the GLB/GLTF, but the rendered texture images are missing. Normal Moho Save, Render, and Export Animation operations can write to that external drive without issue, and Moho on Windows can export the complete GLB to that same external drive over the network. Full Disk Access for Moho on macOS does not change the behavior. Your LM_RenderLayerImage test succeeds, but its RenderLayerImage() output is automatically written to the Desktop/internal drive, so it doesn’t exercise the failing external-volume issue.