UU3D exports to MDL4 or 5. You are better suited to export from Blender, which exports to MDL7. At least for static stuff. For animated stuff UU3D's MDL5 could be an option. But with animation i would suggest to export to FBX, then load the FBX into MED ...

You say your FBX doesn't work proper? Is this FBX from UU3D or from your render app? I have no trouble with the from UU3D exported animation ...