In order to be sure of what you are using, which version of the Editor are you using? Version 3 or version 4?
That will help me to understand the problem and/or how we can fix that
Hum, the editor V4-beta.7 is up to date with the gltf loader. Do you confirm, if you drag’n’drop your gltf model in the BabylonJS sandbox, that it works well?
I’d like to know if the problem comes from the editor, the gltf loader or the model itself.
To help you, is that possible that you share your model with me on the forum or in PM?