[jQuery] Form Plugin Large File Upload Problem

[zendog74]

I am using the JQuery Form Plugin on a form that is shown in a modal
window (nyroModal) to upload files. It is working like a charm as long
as the file is a reasonable size. However, if a user tries to upload a
large file (say 100MB or more), when response comes back (HTML
response), it re-loads the entire window, instead of re-writing the
contents of a div in the modal window, like it is supposed to do.

Does anyone have any idea as to what is going on? Seems like it may be
a timeout issue, but I am not sure why it is happening or at which
point it is timing out.

Here is a snippet of the code. Nothing special going on.
"checkCmlUpdateForm" is not shown, but it is a simple data validation
function.

jQuery(document).ready(function() {
        var options = {
                target: '#cmlCreateUpdate_formContainer',
        iframe: true,
        beforeSubmit: checkCmlUpdateForm,
        success: handleResponse
        };
    // bind form using 'ajaxForm'
    jQuery('#supportingDocs').MultiFile();
    jQuery('#cmlCreateUpdate_form').ajaxForm(options);
    jQuery('#cmlUpdate_cancelBtnBottom').bind('click',cancelUpdate);
    jQuery("textarea[name='description']").maxlength({maxCharacters:
4000, statusText: "characters left", notificationClass: "bg_alert"});
});

function handleResponse(responseText, statusText)  {
        // Re-run the search to update the results.
        if(jQuery("#cmlSearch_form").length > 0){
                doSearch('<portlet:renderURL windowState="RAW"/>');
        }
}