Jazz Jackrabbit 3D Helicopter Animation Lowpoly Model Mesh

I’m giving you for that some compressed files for that.

Each time I make the animations and export them they become disconnected when processed into .3d model externally.

And then the obj files look like this
https://www.betaarchive.com/imageupload/2023-08/leotck-1692730890.or.85560.png

with ears disconnected from the body.