RadUpload控件为啥当文件小于5M时进度条不显示

RadUpload控件为何当文件小于5M时进度条不显示
请教各位大虾，为何我引用RadUpload第三方控件当上传的文件小于5M时进度条无法显示，是否可以在哪里设置的？
[解决办法]

 <telerik:RadProgressManager id="Radprogressmanager1" runat="server" />
            
            <telerik:RadProgressArea id="RadProgressArea1" runat="server" />

 protected void Page_Load(object sender, System.EventArgs e)
        {
            if (!IsPostBack)
            {
                //Do not display SelectedFilesCount progress indicator.
                RadProgressArea1.ProgressIndicators &= ~ProgressIndicators.SelectedFilesCount;
            }

            RadProgressArea1.Localization.Uploaded = "Total Progress";
            RadProgressArea1.Localization.UploadedFiles = "Progress";
            RadProgressArea1.Localization.CurrentFileName = "Custom progress in action: ";
        }

        protected void buttonSubmit_Click(object sender, System.EventArgs e)
        {
            UpdateProgressContext();
        }

        private void UpdateProgressContext()
        {
            const int total = 100;

            RadProgressContext progress = RadProgressContext.Current;
            progress.Speed = "N/A";

            for (int i = 0; i < total; i++)
            {
                progress.PrimaryTotal = 1;
                progress.PrimaryValue = 1;
                progress.PrimaryPercent = 100;

                progress.SecondaryTotal = total;
                progress.SecondaryValue = i;
                progress.SecondaryPercent = i;

                progress.CurrentOperationText = "Step " + i.ToString(); 
 

                if (!Response.IsClientConnected)
                {
                    //Cancel button was clicked or the browser was closed, so stop processing
                    break;
                }

                progress.TimeEstimated = (total - i) * 100;
                //Stall the current thread for 0.1 seconds
                System.Threading.Thread.Sleep(100);
            }
        }