Well, you certainly can upload photos directly from your computer's picture library if you do it right. Once you hit post reply, scroll down to and click on MANAGE ATTACHMENTS. There are three BROWSE windows that let you browse your picture files and then UPLOAD any picture you have in your computer or on a photocard in an attached reader.
This photo was attached from my photo library. Points for knowing what it is.
As for the history of any individual rifle, barring some info like General Whosis's diary entry that he was issued M1903 serial 12345 when he was at West Point, there is simply no way to track most issue rifles. Springfield Research Service, which scans the few existing records, will check to see if they have anything on the number, but to be honest there rarely is.