How do I undo a sponsor skip?

Tap Undo on the card. After a skip, the card at the foot of the Watch screen, directly above Up next, says Sponsor skipped. It stays for 4 seconds.

The video goes back to the start of that part. That part is not skipped again while you keep watching this video.

If the card is gone, drag the bar to go back by hand. To stop a kind of skip for good, change Sponsor skip in Settings. See How sponsor skip works.

To watch a part before it is skipped, tap Watch it while the card counts down.