Workflow with Email Link Host

1. Open the live helper: app-universal-links-helper (source)
2. Enter package name, SHA-256 fingerprints, Team ID, bundle ID, hosts, paths
3. Download or copy assetlinks.json and apple-app-site-association
4. In Email Link Host, set the matching env vars (or drop files under public/.well-known/ for Next builds)
5. Deploy Email Link Host (Docker or static CDN)
6. Point Firebase Auth / app Associated Domains / App Links at that HTTPS origin
7. Verify with the helper’s curl / adb / swcutil commands

Manifest intent-filters from the helper go in your mobile app, not this host.