wow, amazing, you were quick to find the problem. I downloaded them from thingiverse and I guess they don't have many problems with that.
I had a few stl files on my pc and I converted them with blender to gltf+bin
working on linux! i'm trying to import a 3d model, but it crashes when i try to see the pieces menu.
it's an amazing project, I hope you keep updating it. I'll see if I can help translating