Animation not transferring to Sketchfab

Animated in Maya and it looks good there but when uploaded, it doesn’t work.

Trying to animate casters rising up to the model, but when I switch to that animation clip, all the objects clump together.

To toggle visibility, the casters are scaled to 0 when not animating in that clip.

How can this be fixed? All the other animations work, including the wall mount which is set to scale out of view for the caster animation.

Hmm. @waleguene could you take a look?