Offer Attachment Storage

Summary

Where are Offer Attachments Stored ?

Content

As the summary reads, I'm looking to gather information on where Offer Attachments (added when creating an offer) are stored in the system ?
And, is there a way for us to access all such attachments together (more like a repository) ?

PS: I'm lead to believe that this would the UCM, but I'm not sure if that is actually the case

Thanks,
Santhosh