RadzenUpload Component doesn't send request with file

[Lukasz]

Describe the bug
Since 4.28.4 RadzenUpload component doesn't send request with file to server. There isn't any error in console of browser.

To Reproduce
To reproduce BUG use below code:

<RadzenRow>
    <RadzenColumn Size="12">
        <RadzenUpload @ref="_upload" Accept=".png, .jpg, .jpeg, .tif, .tiff, .bmp, .pdf, .doc, .docx" ChooseText="Choose" Auto="false" Multiple="true" class="w-100">
        </RadzenUpload>
    </RadzenColumn>
</RadzenRow>
<RadzenRow class="mt-3">
    <RadzenColumn Size="12">
        <RadzenStack Orientation="Orientation.Horizontal" AlignItems="AlignItems.Center" JustifyContent="JustifyContent.End" Gap="10px">
            <RadzenButton Text="Add" Click="Submit" ButtonStyle="ButtonStyle.Primary"/>
        </RadzenStack>
    </RadzenColumn>
</RadzenRow>

@code {

    [Parameter]
    public Guid EnrollmentId { get; set; }

    RadzenUpload _upload = null!;

    async Task Submit()
    {
        _upload.Url = $"/api/enrollments/{EnrollmentId}/attachments";
        if (_upload.HasValue)
        {
            // this method doesn't send request and nothing happen
            await _upload.Upload();
        }
    }
}

Expected behavior
Executing 'Upload' method of '_upload' object will send request with file.

Desktop

• OS: Windows 11
• Browser Chrome 124.0.6367.203
• Version Radzen Blazor WASM 4.28.4 or higher
• .Net Core 7

[Vladimir Enchev]

Just setting the Url like this will not work - you need to attach it to variable at least:

<RadzenRow>
    <RadzenColumn Size="12">
        <RadzenUpload @ref="_upload" Url="@url" Accept=".png, .jpg, .jpeg, .tif, .tiff, .bmp, .pdf, .doc, .docx" ChooseText="Choose" Auto="false" Multiple="true" class="w-100">
        </RadzenUpload>
    </RadzenColumn>
</RadzenRow>
<RadzenRow class="mt-3">
    <RadzenColumn Size="12">
        <RadzenStack Orientation="Orientation.Horizontal" AlignItems="AlignItems.Center" JustifyContent="JustifyContent.End" Gap="10px">
            <RadzenButton Text="Add" Click="Submit" ButtonStyle="ButtonStyle.Primary" />
        </RadzenStack>
    </RadzenColumn>
</RadzenRow>

@code {

    [Parameter]
    public Guid EnrollmentId { get; set; }

    RadzenUpload _upload = null!;
    string url;

    async Task Submit()
    {
        url = $"upload/single";
        if (_upload.HasValue)
        {
            // this method doesn't send request and nothing happen
            await _upload.Upload();
        }
    }
}