Update to last Mixamo add-on in Blender
Hi everyone,
There was an error in the last Mixamo add-on (version 1.11.10) for Blender when you click on the Edit Control Shape button. This has now been fixed in a new version which can be downloaded through the link attached. This new version still supports Blender 3.0 or higher.
https://substance3d.adobe.com/plugins/mixamo-in-blender/

