Hi

Is it possible to use external storage to store Attachments? 

As a company we have large files that sales need to upload and associate documents to opportunities. We also want to save on the Salesforce storage costs.

To the sales user it would appear that the attachment is being uploaded into SFDC but behind the scenes it would saved on something like Sharepoint, or Dropbox. SFDC Links to Edit/View/Del the attachment would be redirected to do the operation on the file in external storage.

I have seen things like File Connect but it looks like it syncs with an external storage rather than use it store documents, file, attachments etc.