Telerik AllowedExtension doesn't filter the file to select

Question

I am trying to validate the File Select example link here Telerik File Select but the AllowedExtension list doesn't filter

This is the given example code of Telerik

@* Some images are only allowed, min size 1KB, max size 4MB *@

<div style="width:300px">
    <TelerikFileSelect AllowedExtensions="@AllowedExtensions"
                       MinFileSize="@MinSize"
                       MaxFileSize="@MaxSize">
    </TelerikFileSelect>
    <div class="k-form-hint">
        Expected files: <strong> JPG, PNG, JPEG </strong> between <strong>1KB</strong> and <strong>4MB</strong>.
    </div>
</div>

@code {
    public List<string> AllowedExtensions { get; set; } = new List<string>() { ".jpg", ".png", ".jpeg" };

    public int MinSize { get; set; } = 1024;

    public int MaxSize { get; set; } = 4 * 1024 * 1024;
}