OK, I am, I guess, dense. I tried advanced search to find out what the techniques and tricks are to attaching photos to a posting. I founds the images that I wanted through browseing, I clicked on choose ( I am a Mac user) and I clicked on upload then done but nothing attached.
Is it possible that because the pictures are big files that it takes a long time to upload and I need to wait a long time? Is there some signal when a picture is finally attached?