I have been trying for weeks to make some kind of sequential number show on the form submission. Do you know any way that is possible for that. That is the only thing i am missing before purchase.

You can use the "Form Submission reference number" in your form. For instructions on how to generate a reference number on form submission, please refer to this documentation: https://formnx.com/details/docs/features/submis...
A sequential submission reference number is being generated upon form submission and you can find your submission reference number under the "List Submissions" section.