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I cloned your form and uploaded 200MB+ file but I was not able to encounter the issue you are reporting. I was able to submit the form properly. Can you try again and see if you will now be able to upload a 200MB file on your form? If you still encounter the issue, based from the screenshot you provided, you have embedded the form on your website (http://shatkinfirst.com/wp/shatkin-first-upload-portal/), have you encountered the same issue using the direct link of your form (http://www.jotform.us/form/53205116166144)? May I also now what is the file type of the file you are trying to upload on the form so we can further check the issue?
We will wait for your response.