Exporting Blendshapes in Unity

Hello.

I'm using blendshapes for my character's expressions.
I've been using blendshapes for my character's expressions, but sometimes the expressions break and I don't know why.

I only know how to create the model and export the fbx data.
I would like to confirm whether the procedure is correct or not.

1. Set up blendshapes in Maya's standard shape editor.
2. Export the fbx with the blendshape.
3. The export settings are the settings listed in the Unity manual, with animation, deformable model, and blendshape enabled.
4. Import it into Unity.
5. Select the model by dragging it into the Hierarchy and you will see the list of BlendShapes in the Inspector.


Is there any problem with the above procedure?
Also, is there anything I should be aware of when setting up blendshapes?

My working environment
Maya2020.2
Unity2021.1.12f1

Thanks.