Update 3DXML in Composer?

In order to bring in graphics/pattern from SolidWorks I exported the SW as an 3DXML file. Now I have updated the original SW file and overwrote the 3DXML file. I am not getting the option to update the file in Composer -only the SW components in the .smg. Is there a way to get around this?

Thanks!

ps - I tried a trick I was told about - to rename the .smg to .zip open then replace the files, but I get an error message when I try to open the .zip

SolidworksComposer