Comment 13 for bug 591501

Time ago, in Access and Visual Basic I've done a form in where the user "drag & drop" a file on a text box, linked to a field in a table. So I was able to store the path for future use.
Just catch the path and store it in a table.
I've work a lot to help the user to avoid overwriting and to simplified the procedure.

This is my suggestion:
Focus on the transaction.
A button on the bottom will be colored or not, depend if the record has a document linked with it.
If it is colored, the user can click on it and the SO open the attachment.
For attach a file, drag and drop the file on the transaction. No file selector.
If the transaction has already an old link: ask the user before proceed.
To remove a link (numble... numble...) A voice in the menu?
[ATTACHMENT]
-[open document] <-grey if no link
-[clear the link] <-grey if no link
The single transaction has various receipts and/or invoices? The user prepare a multi page PDF.