I want to test my form to see how data is stored and can be retrieved

Now I want to test my form to see whether data is stored and can be retrieved.  I receive some free storage space with my Dropbox account.  I'm not clear how to access this storage to retrieve files.

Your form data are stored to our servers. You can access the submissions in the submissions page of the form;

https://www.jotform.com/help/269-How-to-view-Submissions

You can integrate your form with Dropbox, guide here: https://www.jotform.com/help/77-Upload-to-Dropbox-with-JotForm. Note that integrating your form with Dropbox won't bypass your File Storage limit in the account. File uploads are still counted towards your file storage limit. If you'd like to free it up, you will need to delete submissions that contain the files.