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Could you try the following:
2. Log in to your JotForm account
3. Open a new window and log in to your Dropbox account.
4. Repeat the integration, click the "Authenticate" button.
After clicking "Authenticate", you will see this pop-up window. No need to log in because we have already done that already did that earlier on a separate tab. Click "Allow".
That should integrate your Dropbox to JotForm properly. Do let us know if you need more information on this.