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Do you mean to say that your form's custom URL shows 404 error message?
I did check the URL and I am unable to replicate the issue you are having. It does display the form correctly and I was also able to submit it successfully. Please check the screenshot below:
I would suggest you to test your form again and get back to us if the issue persists. You may also lile to share a screenshot of the issue as well. The following guide should help you how to upload image in forum post: http://www.jotform.com/answers/277033
I get the error when the form is custom linked - when not custom linked it works fine
Can you please provide us steps on how to reproduce the problem?
So far like my colleague Ashwin, I could not reproduce the problem when I submit the form using your custom URL https://form.jotformeu.com/Mobileonix/pieta
Here's a full screencast: