Exporting animation to Unity I’m quite new to Blender.

I made a simple scene with two cubes and animated only the top cube.

It seems to work in Blender, but when I import in Unity the two cubes are rotating, not just the one with the animation.



How can I fix this?
If you don't assign some verts to any bone those verts will be assigned to the root bone in Unity. You can't make this animation works in Unity with only one bone. So add an other static bone and assign the big cube's verts to it.