Metallic effects not being exported with gITF 2.0 format

Hi, I posted this around various Blender forums, but realized this may have something to do with Nomad…

Basically, I’m trying to export my model to Sketchfab using the gITF 2.0/.glb file format, including metallic painting effects. I created and painted my model in Nomad Sculpt. I then exported the .glb from there into Blender. To get my painted roughness and metallic effects to appear in Blender, I followed the instructions in the video at the bottom of this page: Nomad Sculpt manual - Files which worked, I can now see the metallic effects in Blender. However when I export this .glb to Sketchfab, there are still no metallic effects on my model. I actually noticed when I re-imported this edited .glb file in Blender, the nodes I had set were changed (see the last image here) . My metallic effect is now also not appearing in Blender anymore. So basically, the edits I made using the instructions in the video don’t “stay.” Is there some way to get the roughness and metallic effects to import into Sketchfab as well? Perhaps I need to bake the effects into textures in Blender? (I’m totally new to any of this btw.) Thanks!