Admittedly, I pretty much tried to fit a square peg into a round hole, but I accidentally used the image upload button instead of the link button when trying to post a link to a question.
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Previous State
This might bite someone who say, tried to use a imgur or other image upload site link they thought was a image but wasn't.
I feel like the error could be more descriptive than "unhandled web exception" - especially if the uploader assumed the link was an image file rather than a link