When emailing a PO to a supplier, I often need to attach CAD files as well. The system, lets me add .dwg files, but will not let me send 3d CAD files such as Solidworks drawings or generic 3D files such as .stp (.step), or .iges. It is a fairly important feature if you are a manufacturer!
Also it doesn't let me send .DWG files (upper case intentional) as attachments, but does send .dwg files. Some of my systems save as uppercase extensions. Could you make attachments case insensitive for file extensions please?