sbmama: When you hit "reply", there are three clickable areas at bottom of post. Click on "GO ADVANCED".
In the middle of the new page is a section entitled "ADDITIONAL OPTIONS". In the middle of the
"ADDITIONAL OPTIONS" area is a section entitled "Attachments". Click on "MANAGE ATTACHMENTS".
A new window opens. In the upper right of the new windows is a button saying "ADD FILES". Click on that button, then select the files you want to upload. You don't have to do anything after that...all files that you add are put into your post.