The app's "File Upload" functionality allows for uploading files from the Update Client Details Form to the specific Salesforce record. 

A user may also want to upload files to the record for further use, so this feature will help the user fulfill that purpose. The user can upload a file up to the size of 10 MB and remove it as well before submitting the form.  Please contact us to enable this paid add-on (setting).

PS: The user approving the form submissions will need “Query All Files” permission to view (and approve) these uploaded files.