When the project was created, two free domains are generated.
yourproject.web.app and yourproject.firebaseapp.com.
I don't own a custom domain, so I have to implement Dynamic Links for free. To use Dynamic Links, I must edit the DNS of my domain to authenticate, but I can't find how to edit.
To edit TXT record, open the manage page of the domain in general. But I can't find the page to do like this.
This means it has no way to change TXT record of free Hosting domain?
Thank you, @abraham!
As he/she said it was able to creat with project.page.link.
https://firebase.google.com/docs/dynamic-links#custom-link-domains