Report Model managment is discontinued in Reporting Services Web Portal

RS Web Portal is the new name for Report Manager of earlier versions.

The following two features related to Report Model are discontinued  in SQL Server 2016.
Whereas HTML4 is supported, the future SQL Server Reporting Services will be using HTML5.

Feature                                                                Replacement or workaround
Upload report models through the web portal     This can still be done through the SOAP API.
Manage report models through the web portal    This can still be done through the SOAP API.

However the Report Model is still retained in couple of places, for example the Window for selecting permissions for a Custom Role.