Attach multiple Dropbox files to one category

I am attaching files to the categories in my taxonomy. The files are in Dropbox. I right click the file then copy the Dropbox link. Then I paste it in the box marked URL.
The problem is that the after a user clicks on the file and clicks “download” the file appears but also includes a link to my Dropbox “Back to Dropbox.” Is there a different plugin I can use that excludes the “Back to Dropbox” link and at the same time allows more than one image to be attached so that when the user clicks download all the images attached to a particular category may be viewed.