Y'know- Add pics to an existing post. I don't think the addd attachment buttons come back in edit modes....
EDIT:
OK, first I had to figure out what RTFM meant (it was what I thought), then I looked at the FAQ post about adding attachments. It didn't tell me anything new, so I decided to check my theory... and it was WRONG. Looks like add attachnent is right here....
I really thought I had tried this before and it wasn't possible, but I must have been in "quick edit" not "full edit".
Thanks
Andy.