There are three methods to access the files uploaded in a form subscription:
From the list:
Go to the list and click on it:
Next to each contact, you will see the file, click on it:
Once you click on this, the file will open.
From Export Contacts:
Another method is to Export Contacts:
Once your export is completed, open the excel sheet and click on the links to view the file (or open the links in your browser):
From Lead Profile:
The third method is to go to the contact’s profile, and copy the file and paste it in another tab: