iPhone or iPad not detected when recording its screen on a Mac

The New Recording window says No iPhone or iPad connected, or the recording fails with The device didn't share its screen.

Cause. iRecord records a device's screen over the cable. A device that is asleep, locked, or has not trusted this Mac stays connected and simply sends nothing.

Fix

1. Connect the device to the Mac with a cable. Wireless is not supported.
2. Unlock the device and leave it unlocked.
3. Tap Trust This Computer if the device asks, then enter the device passcode.
4. Return to the New Recording window and choose iPhone. The device appears in the list on its own; there is nothing to refresh.
5. Press Record.

iRecord waits for the device to actually hand over its screen before the take starts, so a locked or untrusted device fails with the message above rather than saving an empty Take.

A device recording is portrait when the device is portrait, and Save Video exports it that way with no configuration.