[Zope] Images and Zope1.10.2

I have a nifty system whereby each individual I add to a database automatically gets a personal directory and password. One of my users has come to me with a problem. He can add images to his directory, but cannot subsequently edit the image (i.e. open the image's manage screen) as it complains about lack of permissions. The security role he has contains all the image related options I see. He can delete it, btw. This is not an immediate issue, but I do wonder why the permissions don't seem to be working in a sensible manner. Why should he be able to add images, but not manage them? Are there extra 'image manage' permissions? If so, where do I find them?