Multistep form connection to a database except Contacts

Let me clarify a bit. At the first step you can see the first step of multistep form. You can continue by clicking on Author(s) informaton button. It leads user to second step. Fixing the form is ok. But when I want to see the records on “Multistep Registration” data table which is generated together with the multistep form by the system automatically, It is not possible to see data. As you can see at the connections settings there is only one choice to send the collected data to the Contacts database table. Additionally this database does not allow to upload document files. I share the link if you want to see the webpage. Thank you for your efforts.

https://www.equalityreview.org/submission-3