I have just tried 3 times to attach the photo and can't. I'm not doubting the steps in the link you gave me for attaching a photo, I believe there's something wrong with my program. Everything is normal up to step #4. When I click "Attach This File", I get a small green 'progress' that runs at the bottom of the screen. When it completes, I lose the browser 'drop-down' window and both the 'Browse and Clear' buttons and I do not get the 'Add To Post/Delete' option button.
I didn't try the URL thing yet, but I have posted a couple of attachments in the past using the same methods I'm trying to use now, so the program has worked.
I looked at the other post you suggested regarding the 'screenshots'. As a test, I took a 'snippet' (50.0kb and saved it as a JPEG like the photo I'm trying to attach) and then tried to attach it..... that worked! I then went into the properties of the photo I can't attach to be sure the photo wasn't larger than allowed..... and it's smaller than the 2MB single file size (it's 1.17MB). I tried to attach several different photos, (other than the original 3-D photo) of different sizes, 1.50MB and smaller without success.