To upload to c3 arcade, try adding an additional. ".txt" to the glb/gltf filename in the project and change path to match. Good luck with your game, send a link when you can.
You may also need to use gltf format instead of glb.
Viewing post in Construct 3 3DObject Plugin - SDK V1 only comments
Thank you very much, I was able to upload the game thanks to your mode, my game still has a long way to go and bugs to resolve since it is the alpha version, it is only the bases, Thank you very much. I send you the link
https://www.construct.net/en/free-online-games/power-rpg-c3-3d-online-24422/play...