Private file — open in owner browser
A temporary link for a private file was opened, but the browser is not signed in as the file owner. Full text asks you to use the same browser where you are signed in as the owner, or sign in and try again.
Why this happens
Private grants still require the owner session at consume time (/d/{token}). Sharing the token with a guest or another account fails this check. Public files do not use this rule.
Diagnose and fix
1. Owner: open the link while signed in as yourself in that browser.
2. To share with others: make the file Public, then mint a normal public grant.
3. Do not expect a private /d/ link to work logged out.
4. Mint failures for non-owners use the “only the owner can create a link” messages instead.