Before the upgrade you had to modify an item if you wanted to add multiple files, now you don’t need to. You can either choose to attach another file whilst still on the add item page, or use drag and drop to upload files to the Content Collection and then add them to your module (you don’t have to leave the module to do this anymore).
Attach another file: http://www.leeds.ac.uk/vle/demos/additem/additem.html
Drag and drop: http://www.leeds.ac.uk/vle/demos/add_files/add_files2.html
VLE Service website: http://www.leeds.ac.uk/vle