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To my understanding, you tried to integrate the form you created with Dropbox and you're looking for the link to that integration, is that correct?
Unfortunately, there is really no link that will be produced when you integrate your form with Dropbox unlike with Google Drive or Google Spreadsheet.
However, if, in any case, I have misunderstood your concern and you are referring to a different concern, please feel free to let us know so we can help you further.
When a submissions is forwarded to Dropbox, a folder will be be created there. You can check for the folder directly in Dropdox. Unfortunately, as my colleague mentioned, there is no URL provided from the integration screen.