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I see posts like this fairly frequently. Usually, it happens when a user uploads a file using the controls below post a answer and the file is not a jpg, gif or png file. Such files appear to upload successfully, but then nothing appears in the forum as they are not of the correct file type.
Also, who requested the screen shot? generally you want to find and open the thread where that request was made, then use the upload controls to upload the image as a reply to that thread so that readers can see the context for the requested image.