How can we improve WHMCS?

When a client attaches a screenshot to a support ticket, even though WHMCS is smart enough to generate a thumbnail of the image, clicking on the thumbnail prompts the user to download the file. It would be better if the thumbnail opened the image in a lightbox so it can be viewed right away in the browser without needing to download it and open with an image viewer.

There could still be a "download" or "save" button underneath.