Consider  the problem of a company that owns over 100 buildings. 
        Tradesmen and vendors who work on these buildings must submit insurance  certificates annually. There could be over 1,000 vendors, each with over 20  certificates.  This would result in  20,000 certificates to be requested, received, reviewed, and stored for  safekeeping.   Managing the email  activity related to each certificate is a job in itself. 
The vendors can be notified of their insurance certificate requirements on the web site. They can see the required language for the certificate. They can upload an image of their completed certificate right on the web site.
The real estate company can review the certificates without having to read, download, store, or copy the certificates to a permanent place. They can review the certifidates in place. And with the click of the mouse, they can request that the vendor resubmit for one reason or another.