To answer the two direct questions first:
- What is the "_content" folder mentioned in the example, is this created in the wwwroot folder when adding the nuget feed to the project? Or does one have to create it manually before adding the nuget feed? - this is the folder that contains the static assets from the packages that the project references. This is where our JS Interop file resides, for example. The build process copies it from the local nuget package that is expanded into the local nuget cache into the project's target folder.
- I suppose its obvious, but I will ask - I guess I need to use the 3.1 preview of .net core - yes. At the moment, .NET Core 3.1. Preview 1 is the latest and the only supported SDK.
I am pasting here my answer to your ticket on the continued 404 of the static asset:
This means that the build did not successfully copy the static assets from our NuGet package into the output folder of the problematic project. This is something that the framework does and we can't influence. The only suggestion I can make is to try the steps from this article: https://docs.telerik.com/blazor-ui/troubleshooting/js-errors. Assuming that the correct package is referenced (not the trial one) the only other hope is that cleaning the bin, obj and local cache folders may help.
Of course, you can also use our CDN.
UI for Blazor