Only one image can be displayed per project so if there is already one there it will be replaced by any new image loaded - but not always! There are problems. This tool is not to add images of people who are connected to the project - those must go onto the profile pages - but to illustrate the project. Once there they cannot be edited. They can be removed (theoretically) by clicking the edit link alongside the project field under the image in your folder, and then clicking the x next to the project.
Hopefully the little foibles will be ironed out!
It is probably best to add images only if there is not yet an image there - or if you have one that would be better suited. I think it would be a good idea to start a discussion asking other collaborators if it would be a acceptable to change the image. Unless we do this I think we will have "edit wars" over images!!!
