SSRSViewer in Blazor (.NET CORE 3.1) Server code example not compiling

I have a test Blazor/ASP.NET CORE hosted app. I'm using .NET CORE 3.1. I've installed via NuGet the Blazor components, in both the Client & Server projects. My server code is not compiling.

I'm using the documentation found here:

For the server side, you have an image of what the server controllers should have:

Note the "ReportController.cs" and "ReportController.Custom.cs".

The code that you recommend is:

image.png

The code is not compiling for me.

First, where does "ReportController.cs" come from? It was not installed by the Nuget package. Where can I find some sample code for this file. I can't override or add partial methods to a file that doesn't exist.

This code is not part of Radzen.Blazor components - it’s generated by Radzen for every project.

I see. It is a Blazor component, but not part of the free Blazor components.