File Upload/Copy from another Http Url in SharePoint Online using REST and jQuery

SPO-FileUpload.js

var SourceList = "SourceList";
var DestinationList = "DestinationList";
$(document).ready(function() {
    exec();
    $("#myBtn").click(exec);
});

function exec() {
    var sourceId = 12;
    var sourceAttachmentUrl = _spPageContextInfo.webServerRelativeUrl + "/_api/web/lists/getbytitle('" + SourceList + "')/Items('" + sourceId + "')/Attachmentfiles";
    //var targetAttachmentUrl = _spPageContextInfo.webServerRelativeUrl + "/_api/web/lists/GetByTitle('" + DestinationList + "')/items('" + 182 + "')/AttachmentFiles/add(FileName='{0}')"; 
    var targetAttachmentUrl = _spPageContextInfo.webServerRelativeUrl + "/_api/web/GetFolderByServerRelativeUrl('/sites/SM/Shared Documents')/Files/add(url='{0}',overwrite=true)";
    console.log(sourceAttachmentUrl);
    $.getJSON(sourceAttachmentUrl, function(data) {
        //console.log(data);
        $.each(data.value, function(i, v) {
            var fileUrl = v.ServerRelativeUrl;
            var fileName = v.FileName;
            //console.log(v);
            var oReq = new XMLHttpRequest();
            oReq.onload = FileLoad;
            oReq.open("GET", fileUrl, true);
            oReq.responseType = "blob";
            oReq.send();

            function FileLoad(e) {
                var blobData = oReq.response; //not responseText
                var blob = new Blob([blobData]);
                PostToDest(targetAttachmentUrl.replace('{0}', fileName), blob);
            }
        });
    });
}

function PostToDest(url, bytes) {
    return $.ajax({
        type: "POST",
        url: url,
        headers: {
            "X-RequestDigest": $("#__REQUESTDIGEST").val(),
            "binaryStringRequestBody": true,
            "Accept": "application/json;odata=verbose;charset=utf-8"
            //,"content-length": bytesLength
        },
        processData: false,
        data: bytes,
        success: FileUploadSuccess,
        error: FileUploadError
    });

    function FileUploadSuccess(data, textStatus, request) {
        //console.log("File uploaded successfully");
        var newfileUrl = data.d.ServerRelativeUrl;
        $.get(newfileUrl, function(data, status, request) {
            var bytesLength = request.getResponseHeader('content-length');
            console.log('Byte Length is ' + bytesLength);
        });
    }

    function FileUploadError(jqXHR, errorText) {
        console.log(jqXHR);
        console.log(errorText);
    }
}