Redirect to list view after SPServices Update

Question

Hello Techies,
I created a custom form to submit list item and attach multiple attachments.

And would need to redirect user to default list view after all the attachments are attached to a list item.
I tried adding window.location.href='default List url' but it redirects while the attachments are getting added.
It works fine for small file(s) but for large file(s), only 1 attachment gets added.
Here is the snippet:
HTML:

<table align="left" border="1" cellpadding="0" cellspacing="0" >
<tbody>
<tr>
<td  valign="top">
<h3> Nameh3>
td>
<td valign="top" style="padding:9px;">
<input type="text" value="" maxlength="255" id="Title" title="Name" style="width: 96%;" ms-spellcheck-true">
td>
tr>

<tr >
<td >
<span style="font-family: " segoe ui" ,sans-serif; color: #444444">
Click here to attach file
span>
<div id="attachFilesHolder ">
 <input type="file" id="attachment" name="FileUpload" multiple/>
div>
td>
<td>
td>
tr>
table>
<div>
<input name="SaveItem" style=" height: 40px; font-size: 15px;" id="NewSaveItem" accesskey="O" onclick="" type="button" value="Click here to submit " target="_self">
div>
And here is my js:

var ListTitle = "SubTask";

$( document ).ready(function() {
//$('#attachment').multifile();
    $("#NewSaveItem").click(function() {
    CreateNewItem();

});


});

function CreateNewItem() {
    var data = {
        __metadata: { 'type': "SP.Data.SubTaskListItem" },
        Title: $('#Title').val()
    };

    $.ajax({
        //_spPageContextInfo.webAbsoluteUrl get current SharePoint site url
        url: _spPageContextInfo.webAbsoluteUrl + "/_api/Web/Lists/GetByTitle('" + ListTitle + "')/Items",
        type: "POST",
        headers: {
            "accept": "application/json;odata=verbose",
            "X-RequestDigest": $("#__REQUESTDIGEST").val(),
            "content-Type": "application/json;odata=verbose"
        },
        // to make sync calls.
        async: false,
        data: JSON.stringify(data),
        success: function (data) {
            if (data.d.ID != undefined && data.d.ID > 0){
                //Uploads files to SharePoint List item
                UploadFileToListItem(data.d);

                }
            else
            {
                console.log('Item added successfully');
                }
        },
        error: function (error) {
            console.log('Problem saving data');
        }
    });
   // window.location.href = 'https://connect.sharepoint.com/sites/SpApps/Lists/SubTask/';

}



//Once the item is created now let’s try to upload documents to SharePoint list item.

function UploadFileToListItem(data) {
    var element = document.getElementById("attachment");
    lastFileName = element.files[element.files.length - 1].name;
    for (var i = 0; i < element.files.length; i++) {
        var file = element.files[i];
        uploadFile(data, file);
    }
    alert('Done');
    window.location.href = 'https://connect.sharepoint.com/sites/SpApps/Lists/SubTask/';
}

//uploads single file at a time.
function uploadFile(data, file) {
    var getFileBuffer = function (file) {
        var deferred = $.Deferred();
        var reader = new FileReader();

        reader.onload = function (e) {
            deferred.resolve(e.target.result);
        }

        reader.onerror = function (e) {
            deferred.reject(e.target.error);
        }

        reader.readAsArrayBuffer(file);

        return deferred.promise();
    };

    getFileBuffer(file).then(function (buffer) {
        var binary = "";
        var bytes = new Uint8Array(buffer);
        var i = bytes.byteLength;
        while (i--) {
            binary = String.fromCharCode(bytes[i]) + binary;
        }
        var fileName = file.name;
        var error = ''
        $().SPServices({
            operation: "AddAttachment",
            async: false,
            listName: ListTitle,
            listItemID: data.Id,
            fileName: fileName,
            attachment: btoa(binary),
            completefunc: function (xData, Status) {
                console.log(file.name + " uploaded");
            }
        });
    });


}