Not necessarily Terry, it depends on the genealogist. I uploaded a small gedcom just to learn the process (and I do recommend adding your 'tree' in small chunks) and it had plenty of sources for each person.
For those brave souls that worked with the original process, or those that haven't added one, there is a Help Page with a visual walk through.
And yet, people still use them. It's still fairly common for people to ask a question about uploading a GEDCom file several thousand strong.