The private-link controls — expiry, password, custom domain, searchable opt-in, analytics, white-label — and which plan unlocks each.
Pointing a subdomain at a private-link host so the URL says your brand, not the vendor's. Steps, DNS gotchas, and when the apex vs subdomain choice matters.
A short-lived link reads as a feature for one-off reviews and a bug for permanent references. The shape of the engagement decides which one the file needs.