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When I logged in to your account, I see that you have 67 forms.
Can you provide us name or ID of your form?
When I've logged in to your account, I've checked your form which is http://www.jotformpro.com/form/51593015577964. I am able to upload file on my end.
Please, provide more details of your concern. You can send the screenshot of your issue. This will help us better analyze the problem.
I will wait for your reply.
If you have any question or issues, please do not hesitate contacting us. We will be glad to assist you.