Objects looking black in shapespark

I have imported model from 3ds max. Some objects are looking black which look fine in 3ds max. What must be the reason?

same location in 3dsx max looks just fine:

Probably there is a problem with normals in your model.
you can find some explanation and tips here: https://help.shapespark.com/hc/en-us/articles/7387358673809-Normals-weird-shadows-on-geometry-

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