Firefox maintains the text (and photos) when you click the back button to see the photos on the original posting, then come back to the entry screen; MSIE does not (or at least, MSIE 10). Now I'm using Chrome - what does it do? Maybe I need to post this first.
OK, now if I click the back button, then come back ... everything is still here. I may as well test something else I wondered about - can I edit and reuse the same attachments window if it's still open. No that doesn't seem to work. The window replaces the photo it shows as being uploaded, but the posting shows the original photo.