Who can help me about how to using unity export plugins?

Using this plugins in Unity,but export model has questions when I import to sandbox.
Someone please teach me?

Unity version :2020.3.16f1
Babylon Editor Toolkit Version:5.00-A24.9x

cc @MackeyK24

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I think those requires @MackeyK24 custom tools who are not available in the sandbox.

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ok,thank you