One URL per line. Optionally prefix with a title on the line before.
After a page is archived, a judge can read it to decide whether the fetch actually captured the page (rather than a login wall, consent banner or error page) and what kind of page it is. Search hides uncaptured pages by default and can filter by kind.
Some pages only render for a signed-in browser or after JavaScript runs, so the server's fetch gets a login wall or an empty shell and the judge marks the page uncaptured. With the extension's "Recapture uncaptured pages" option on, your browser polls for such pages on the domains ticked below and captures them itself, from its own session: first a quiet fetch with your cookies, then, if that is still a wall, by opening the page in a background tab. No cookies ever leave your browser. Each page is tried at most twice.