Lately I have been do a ton of development with WordPress for use in a few websites as CMS – which I will be doing a few post on at some point – and I found using the Media Library to be a bit lacking. Not to bash anyone but there just seemed to be some very basics things that were over looked.
One of which was the ability to update the files you posted, you can edit the titles and captions, you can event delete the file but you can’t upload a new version of the file. You would need to delete and repost the file which is a process not easily communicated to a customer or a wife using WordPress. So I create the Attachment Manager to fill that void. What it gives you is the ability to re-upload a new version of a photo or a pdf or what ever you are trying to update without cause a bunch of hardships.