Hi, vidjo, 1. edit animations in FBX expand the fbx in unity, you could see the animation data, use Ctrl+D to duplicate a copy and edit it. The video 1.4 Modify animations from FBX files demos the process. 2. edit muscle clip ( well. this looks like the official name ) There're three kinds of clip, Legacy, Generic and Muscle. You could directly edit Legacy / Generic clips , for Muscle clips, you need to convert it to Legacy/Generic clip with our MuscleClipConverter first. The video 4.5 Convert Muscle Clip to Legacy/Generic Clip demos the process.