Under Preferences, Advanced, Default Creation Permissions (DCP). Set Materials to Copy. Upload Material, select a .glb file and bulk selection for textures. Materials upload as Modify, Copy, Transfer NOT the DCP setting of Copy. Note: During the upload above Texture DCP were set to Modify, Copy, Transfer. This overrode the Material DCP setting. In the scenario above the correct outcome would be materials to be set as Copy, not Modify, Copy Transfer as it's using the material upload function not the texture upload function from a hierarchy standpoint. However, the Texture DCP is overriding what is set for Material DCP. Note this is present in Firestorm too as well as the LL Viewer.