"Blender to Roblox: Which Format, OBJ, FBX or GLTF? (https://www.katsbits.com/codex/blender-roblox-which-format/)" https://www.katsbits.com/codex/blender-roblox-which-format/ a quick look at the mesh (model) formats Roblox supports - originally a 'note to self' worth writing up.