una/neo/packages/app/customization/loading.js

import { Loading as LoadingDefault } from 'app/default/loading';
// DON'T EDIT THIS FILE IN MAIN REPO!!!
// only for custom projects change some specific static components here if needed
/*
export function Loading() {
    return <div style={{
     width:'50%', height:'50%', display:'flex', margin:'0% auto', padding:'20%'}}><img src ="any file"/></div>
}
*/
export const Loading = LoadingDefault;