After skin mesh fitting, the fitted mesh does not appear in post wrap

I am a beginner of Audio2Face. I just imported a custom FBX into Audio2Face and want to create a set of blendshapes for it. However, after skin mesh fitting, the fitted mesh did not appear in section Post Wrap. And I cannot grab the fitted mesh into the input field. Did I miss something?

Could you please send your latest Audio2Face log file? It should be located inside C:\Users\<USERNAME>\.nvidia-omniverse\logs\Kit\Audio2Face on Windows and ~/.nvidia-omniverse/logs/Kit/Audio2Face on Linux?