Overwrites every task's status with "Done". Original statuses are lost permanently. Make a copy of the spreadsheet first.
Restoring an archived task used to reset it to Not started, even if it was Done. That's fixed going forward, but it overwrote the old status, so the affected tasks can't be identified automatically — tick the ones that were actually finished.
Tip: a restore updates the "last changed" date, so everything from one restore shares that date.
These tasks are past their due date. Reschedule, mark done, or open to edit.
To replace the file or URL itself, delete this item and re-upload/re-add.