I have looked and looked and did not find the question I have. The question is can people who are registered upload photos?? Will coppermine create a thumbnail??? I was looking at PhotoPost PHP and wondered if coppermine can do the same thing??
They can if you allow them to do so. If you allow uploads, thumbnails and intermediate-sized images are of course created - that the point of coppermine. You toggle the permissions to upload on the groups page. Details can be found in the docs. I find it hard to believe that you have looked carefully.
Even the website's homepage (http://coppermine-gallery.net) lists the major features which covers both above mentioned features.