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Problem with mesh faces

So I have a problem , I need to import a mesh but when the mesh is in the engine , the faces are inverted.
in blender :

https://forums.unrealengine.com/filedata/fetch?filedataid=118054&type=thumb

in Unreal engine :

https://forums.unrealengine.com/filedata/fetch?filedataid=118055&type=thumb