Where are the Internet Expenses report attached receipt files stored? How to find the actual files

We are on R12.1.3 and have Internet Expense installed. We are trying to use scan receipt image and upload the file attach to expense report line or header. I did some test and found the image file information is stored in fnd_attached_documents and fnd_documents tables. The short text is stored in fnd_document_short_text table. I checked the fnd_documents_long_raw table but could not find any media_id associates with the attached image file. Where can I find the actual image files which attach to the Internet Expense lines/header in the application server or database tables? Can someone tell me where these image files