Question How can I give the loader object a shadow in force?

Hello, I'm a beginner to the Unity platform and am slowly learning how to use it.
I've almost worked out how to use lighting and other tools, but I'm having difficulties with my model's light and shadows.

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I'm currently accessing the project file zepeto studio unity - the playground unity file to access and load my character. It is meant to allow users to test the characters by loading them - for example, by entering their game ID and playing the scene to see their characters present.

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I only wanted to put a shadow on this loaded figure using global light, focused light, and so on. However, regardless of whether I place a 3D item behind my character to see shadow reflection, check the quality settings (ultra, distances, etc.), or use the mesh filter mesh loader, it cannot see any shadow behind my character. I deleted and reinstalled all of the software, but there is still no shadow.

Is this because it is simply a loaded character model? Is the shadow still accessible anywhere? even if it is forced? Should the loaded character be converted into an asset, such as a mesh? I'm in need of guidance and wish I could obtain it here.

Thank you for the reading!

 

Oh, I see. Do you think the model will not receive shadows even if I added the shader assets from store? and applied to the model? Because if the plugin is the main problem, I can see why.

And, while this may be a different question or approach, I have seen some people notice the shadow by placing the 3D model plane behind the figurines. Then this might be another possible example? I am sorry for bothering you with questions.