assembly created by mold feature....not being taken into the vault

We have a user who has not been sucessful uploading the assembly that SW created when using the mold feature.  It says it has to be uploaded separately?  Can anyone shed light on this?  Attached is the tree as shown in vault, with the external ref's in gray.  Why did these "interim assemblies" get dropped from the check in?

thanks

Sandy

SolidworksWorkgroup Pdm