You should provide as much as information you can. There are two section to provide the documents.
Scanner (Security Checks): Upload security scan document which verify that your application does not has any vulnerability.
Just below that you will have another option of put your explanation document if scanner report found the vulnerability but it is false as per the application use case.
Other documentation section is used to provide any important application details which a security engineer may ask you when they test your application. You should think and provide all use cases or technical explanation so engineer can understand the application is safe.
This is optional but there is no harm if you have additional information and ready to provide.