Ellen, A photo in the message board is a referenced photo linking back to the web page where the photo resides. HTML IMG code allows that photo to be seen in a message. It is like a web page contained in another web page. So, if you delete the uploaded photo, move the uploaded photo, change its web page location, etc. the referenced link gets broken and the photo does not appear in the message. If you accidentally delete or change a photo you can re-upload it and then go back into your message and edit the IMG link to the new one.