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Yes, it is possible on the new Dropbox integration wizard as well; but you need to remove and re-integrate it again. By doing this, the previous ones will remain and the new submissions are coming with the new naming. Please, note that if you don't remove integration before renaming, this method will not work.
To do that, please follow the steps after removing previous Dropbox integration (the "Apply" button must appear and you need the click it after naming to confirm your operation):
Please, follow these steps and let us know the results.