I can't seem to get this to work.
I tried with creating a new Blazor app (.net 5 and .net 3.1) from scratch, choosing Authentication and Individual User Accounts.
After that I have imported the Radzen Blazor from nuget and followed the instructions on your page to set it up.
But I can't get it to work. It always replies with 401 even though I have logged in. I have tested with Edge the chromium based version and FireFox.
It still might be my fault but I can't seem to see what I am missing in that case.
Indeed the editor does not pass any HTTP headers during upload. We will add support for custom HTTP headers similar to the one already available in the Upload component.