By design DFP wont store the path to the file in the database. It stores the file name.
You can then simply add the path to the dynamic image on the detail page so it would read something like
/public/images/members/<%=rs_member.fields.item("image")%>
All upload components I have used only ever store the image name. You may be able to store the directory using the bindings for DFP - not sure, never tried it.