Dropbox: How to prevent Jotform storage & only use Dropbox for attachments

I have seen Jotform response:
You can try our autodelete submissions app. It will permanently delete all form responses from your JotForm account as soon as they come in. However, you can still have a copy of your submissions in your email, and your attachments would still be forwarded to your Dropbox account.

Guide:https://www.jotform.com/integrations/auto-delete-submissions

App Link: https://auto-delete.jotform.io/

Note I get a security warning with this link. I want to auto delete file attachments from a single form and not effect any other of my many other forms.

I've seen that non-secure message, but it seems to redirect you to the correct / secure page. Have you tried using the app? Kindly give it a try and see if that works for you.