The place i look becomes invisible

This is what happens when I upload my blender model to substance painter.Why is this happening ?
Untitled Project.wmv (1.9 MB)

Google is your friend.

Check your Normals and flip or recalculate to the outside…see if that helps.

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Really have the aspect of flipped normals, recalculate normals outside must fix.
In Viewport Overlays → Face Orientation
Will enable you to detect flipped normals in edit model

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