I'm trying to figure out how to take the additional files I've added to the iso and have them copied to the hard-drive of the machine being built.

I originally used -x to add a directory to the iso..but I didn't see that directory in the / dir of the newly installed machine. Next I tried adding a cp -R /root/my_additional_stuff /root/ to see if that would copy over my additional directory but that didn't seem to work either.

What would be the preferred method to accomplish getting some custom files copied from the iso to the new machine?