you need to use fbx 2012 udk supports fbx 2012 https://docs.unrealengine.com/udk/Three/FBXPipeline.html you can use autodesk’s tool fbx converter 2013 to convert it to fbx 2012
you need to use fbx 2012 udk supports fbx 2012 https://docs.unrealengine.com/udk/Three/FBXPipeline.html you can use autodesk’s tool fbx converter 2013 to convert it to fbx 2012