If you download the images from the Cisco site and try to use them directly they don't get added to the GISO image. The files come as a tar inside a tar. If you untar the original file then use the inner tar file then the SMU gets added to the GISO image correctly.
Example files are the 4 tar files on this link below:
https://software.cisco.com/download/home/286331656/type/280867577/release/7.11.2
If you download the images from the Cisco site and try to use them directly they don't get added to the GISO image. The files come as a tar inside a tar. If you untar the original file then use the inner tar file then the SMU gets added to the GISO image correctly.
Example files are the 4 tar files on this link below:
https://software.cisco.com/download/home/286331656/type/280867577/release/7.11.2