My Audi Model should look like this (below) but it looks like that (second pic) in studio but when i looked from the inside all the meshes appeared (3rd) so i realized the meshes appearing from outside look doesnt appear from the other view help me fix this problem thanks.
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@SkyReturn
Its a problem thats called “Backface Culling” and happens because:
The faces dont have height or the normals are flipped.
U can select that face in blender and flip the normal then export it.
I cant show where the option is located coz im not on my PC rn but you can search “How to flip normals in Blender.” on youtube. Or search “Backface Culling” incase you want some detailed things about this.
Its not that hard to understand. good luck 
Oh so i click on this that’ll tell me what faces needs to be flipped and flip it?
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yah
theres another option somewhere below to flip normals as well.
theres a better way to do this. you can go into edit mode and click Shift + N and it will recalculate normals.