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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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As I understood your concern correctly, You would like to change upload file name regardless whatever it is to Unique ID of related submission. Unfortunately, there is no way to rename uploaded file names.
However,you integrate your submissions to your Dropbox, as I figured out from screen shot you provided. So, you can configure your Dropbox integration with the Unique ID. Following guidance can assist you to order your submission according to Unique ID.
If you are stuck somewhere while proceeding or if you need our support for any issue, please feel free contact us. We would be glad to help you.
ok shame that it is not feasible . However, it is a Function that will facilitate your many users .PS this by drobox have done . Thank you for your response