Radzen Upload client-side without Url does not triggered?

Radzen.Blazor Components
1

Hi,
I am trying to use the Radzen upload component without a URL in my Blazor Server inside a RadzenTemplateForm. When I click on the Upload and select a file it does not trigger the OnClientChange event. I also set a break point but it does not hit. I am using 4.6.6 version.

<RadzenUpload Multiple="false" Change=@OnClientChange Style="width: 100%"
              InputAttributes="@(new Dictionary<string,object>(){ { "aria-label", "select file" }})" />

void OnClientChange(UploadChangeEventArgs args)
{
    
    Console.WriteLine($"File: {args.Files.FirstOrDefault().Name} / {args.Files.FirstOrDefault().Size} bytes");

        try
        {
            
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Client-side file read error: {ex.Message}");
        }
   
}
2

I think client-side upload was added later - with 5.x.

3

If I upgrade to the latest version, does it break anything with the 4.6.6?

4