Need help! Floor disappears issue

I export the Sketchup model to Shapespark.
One of flooring texture becomes totally black and when I do a test render, it disappears and I can see through the lower floor.
What did I do wrong?

It looks like a problem with face orientation. Please read more here: https://help.shapespark.com/hc/en-us/articles/360009249778-Some-faces-of-a-3D-model-are-not-visible-in-Shapespark

Thanks a lot. It is the face orientation issue. I fixed it.

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