At the moment I didn’t find something, I just share to Kyle a test scene I have used.
Also tell him to check the logger because they could be some infos in it.
I also make a little update recently on the repo to add some error if the filepath is wrong.
I was exporting the scene by clicking on the scene and going to the box in the bottom right and clicking export. You need to go File→Save and then the proper json file is exported.