Dennis Gilgallon,

 

Hi,

 

Currently the Uploader do not support this feature directly.

 

You can use the ctrl.InsertButtonID="MyCustomButton" to implement your request.

 

(Please check the customize UI demo)

 

at the OnPreRender event , you can check the count and disable the MyCustomButton like this way :

 

override protected void OnPreRender(EventArgs e)

{

    base.OnPreRender(e);

    if(ctrl.Items.Count > 4 )

        MyCustomButton.Enabled=false;

    else

        MyCustomButton.Enabled=true;
}

 

Regards , Terry .