Hi Gordon,
It's doesn't really need one there. All the changes that take place on the Media link are actually over in the Resources.
If you click on the unmap you will see that it makes the confirm and relates to the resources area.
If you edit - it takes you to the resources area.
If you delete - it confirm and relates to the resources area. (Note: when you delete within the Media tab, you're only deleting the graphic from that product, not from the resources area.
There is a save button within the resources. Remember some resource items may be used (mapped) to several different products. So managing items is correct to be done within the Resources area.
I think that should help explain. If not, continue the questions.
Lee