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Sorry to hear that, and thank you for letting us know.
We notice you have more than one form that has an upload feature.
Please share the link to the form that is generating this error, we'll be happy to take a look.
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Please use this link instead http://www.jotform.com/answers/301197-Getting-an-Error-520-when-I-click-on-My-file-link-Uploaded-through-Jotform#2 to reply again.