Hi Naxos CG,
have you bake your animation keyframe ? before to export in gltf for your “puzzle” dev. ?
(i use the same constraint for a fanuc robot animation too)
dummy etc… needs to be baked in each frame of your timeline)
For me i have two 3dsmax scene file
i don’t create animation in the “app manager files”, i import my scene in fbx file format and it baked all my keyframe. I used a “template empty scene” (just dome and HDR picture environment)
i try many solutions before that, (it’s far for me), this one works for me.
See you Best Regards
Sorry for my english, i’m french
Alex