Hi, The following GIF animation illustrates my problem: The right hand of the model is not animated correctly in Unity. I had a similar issue before that I solved by setting one of the affected bone's roll value to zero. However, this time I can't find the root for my problem. Do you have any ideas? I've attached a Unity Package with some test files, if you want to take a look. The package contains a blend file, so you will need Blender to test it. Software Versions I am using: Unity 2020.2.6f1 Personal Blender 2.90 Note: The GIF animation was done with constant interpolations between the keyframes. The unity package I provided uses linear or Bezier interpolation. However, the issue is not related to the interpolation mode. I already tested that.