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Unfortunately, there's no option to where you can see the details of what account you integrated to your Dropbox account, we also can't tell in our end which email you used. You will need to check each email that you have to see which of them is integrated to JotForm.
I would also suggest that you check your email, because for each app integration that you have, Dropbox will send you a notification about it in your email. In my end here it is:
I hope that helps.