Hi Charuton,
Thank you for your interest in my AR for WordPress plugin.
You can upload a zip file containing a gltf file which will be unzipped and added to the GLTF/GLB file field.
It will also accept a zip file containing a dxf, dae, 3ds, obj, pdf, ply or stl file and will unzip and attempt to convert it to glb.
If you have any further queries please let me know.
Kind Regards,
Nick