@Vision Pro Engineer I tried to load a usdz created using blender in xCode. All blend shapes are detected but not all can be updated. When I checked the values of blend shape weight set, some of the weight names are blank, and these blank weight names are the blend shapes which do not reflect the weight update. Example: I have 7 shape keys (blend shapes equivalent in blender) in my exported usdz model in blender In xCode, the following can be traced from the loaded model: _weightNames = [0] = (String) "\u{2}" [1] = (String) "" [2] = (String) "" [3] = (String) "" [4] = (String) "blendshape1" [5] = (String) "blendshape2" [6] = (String) "blendshape3" items [0]-[3] has incorrect/blank names It seems that weight names are arranged alphabetically, but only the last few ones can be detected. Are there any needed specification with usdz model? Note: When the usdz I loaded is exported to SceneKit using xCode, all blend shapes can be updated. Thank you!