The heading of your question doesn't match the examples that you've given. Neither plugin is specifically about having multiple files uploaded. Maybe you just meant to say multipart or something. Anyway, as well as the two plugins you've listed there's also "file_column":http://www.kanthak.net/opensource/file_column/ which is worth a look. It has been around for a long time, and very simple in all respects.
However, it is quite easy to handle uploading in Rails. Place one or more
in template file and you can access the
params[:images] as an array of all images uploaded form the form.