let zip = new JSZip();
const img = zip.folder(FileName);
const meshes = img.folder('meshes')
meshes.file(`mesh.` + fileType, url, { base64: true });
zip.generateAsync({ type: 'blob', compression: 'DEFLATE', compressionOptions: { level: 9 } }).then((content) => {
saveAs(content, `${FileName}.zip`);
});