Hi,
You will get the content at the path generally at :
Content Administration--> Portal Content --> Content Provided by SAP.
Once you fine the iView you will see preview button. It will open application in portal.
The iView link which has to be visible in the overview page has to be maintained from SPRO configuration
Authorization check, I mean whether the user is assigned ESS/MSS role from the portal and other PFCG roles from the ECC system.
With Regards,
Ramesh Shrestha