What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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How to change upload size for Upload fieldAsked by acoppola on August 21, 2016 at 12:15 AM
The Upload field on your form must be just using the default allowed file size which is 1MB only.
You can adjust it to allow uploading of bigger file size. Follow this user guide: Changing-the-upload-size-limit
Update your form upload field and try again.
Do let us know if this still did not resolve the issue.