I've discovered in order to have real dynamic linking to a page you need to have it host an "Apple App Site Association" file under the root https://[app.example.com]/.well-known/apple-app-site-association. (firebase dynamic links automatically do this when you add any unused domains). I'd like to be able to upload an AASA file under my custom domains root along with the web app files so when a web app link is clicked in IOS it'll open the app if installed or open the same link on the website if not.
Can this be achieved with custom code/firebase hosting/google domains?