Sent image in Messages app turns into unviewable folded paper image

After sending and image in message app, when going back to view it, the image is no longer there, but there is an image of a paper with a folded upper left corner. Why can I no longer view the image? How can I view the image that I originally set?

[Re-Titled by Moderator]

Original Title: Sent image in messages and then turns into an image of a paper with a folded upper left hand corner that you cannot view