Ursprungligen skrivet av ༒Diegote Deleteado༒:

Ursprungligen skrivet av Zappy:

What "doesn't work"? I never suggested anything that should fix it, I only asked you to import the exported files into a new Blender session to verify that everything is correct in the exported files, to which "[it] doesn't work" doesn't make sense as an answer/explanation.

I'm sorry , I tried check the exported files and they all have the same bone name setup

Ursprungligen skrivet av Zappy:

Then the head doesn't have the same skeleton/armature as the body mesh file and/or the animation file.
Try importing the exported body mesh, head mesh, and animation files into a new Blender session, to double-check whether they all have the same bone name setup.