It appears that photos can be posted by dragging files to the gray bar under where you type the message, it says "click or drag files here to attach them."
It does not seem to appear on replies to messages without photos?
Yup, the message appears on posts if the first post had an image.
Not sure why it behaves like that but I don't see a control to change it.
Thank-you, I'll give that a try. Bob.