Hand models can't get shadow from other objects

Hand models can only get the shadow of the light, but can't get the shadow of other objects.If the First Person Camera's Culling Mask contains Default, the hand model can get shadow from other models, but the game screen will become very strange.If the model's layer is changed to Overlay, the hand models can get the shadow too,but the Main Camera will have problems with its rendering.
 
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