How to Fetch File Name from Default Upload Feature in Telerik File Explorer and Set Character Limit Validation

I am using the Telerik File Explorer in my web application, and I need assistance with the default file upload feature. I have two specific requirements:

Fetching the File Name: How can I programmatically retrieve the file name from the default upload feature in Telerik File Explorer when a user selects a file?

Setting Character Limit Validation: I want to implement a validation rule to limit the file name to a maximum of 100 characters. If the file name exceeds this limit, an error message should appear, instructing the user to shorten the file name.

I tried to fetch the select file from below code. But it wasn’t successful.

    function onClientFileSelected(radUpload, eventArgs) {
         var input = eventArgs.get_fileInputField();
         alert(input);
    }

Note:

<telerik:RadUpload id="RadUpload1" runat="server" allowedfileextensions=".zip,.txt" onclientfileselected="onClientFileSelected" />

This hasn’t used inside my .ascx file.

Default Upload

Above image is when the user selected a invalid file, How do i add a new validation message for the character length.