Option to store multiple documents for a single item
This keeps the site from having to manually combine them into a new single document for storage with the item.
Heather Martin commented
Sometimes there is a need to have more than one file attached to an item record, for example when you need to provide an alternate format copy (for accessibility purposes) in addition to the original document. Also you may wish to post a video with an accompanying transcript, or an image file in addition to a text file. It doesn't make sense to have to create two separate items when the related files belong together. It would also be good to be able to associate two or more different URLs with the same item record.
Colin Bragg commented
This would be useful for adding copyright permissions letters.