Exporting characters to unreal not working

Greetings Unreal ,

We are trying to export one of our characters from maya 2013 to unreal , using fbx 2013 plug for the export . We are experiencing the problem that if we change some meshes they wont show in the character . The only mesh that pops out from our import is the head and the rest is left out . Any tips for importing and exporting characters from maya to unreal or blender to unreal ?

Eratos