Record Audio and Record Video join the page's Insert menu. AVFoundation records, and
crates/mobile stores the result through canvas::recording, which now holds what the
desktop stored: 16 kHz IMA ADPCM WAV and Motion JPEG AVI, the files OneNote 2010 plays.
A bar over the page's foot shows the clock with Pause and Stop; a tap on a recording plays
it with AVPlayer, a video's pictures in the bar, and See Playback follows it.

Audio keeps recording in the background under the audio background mode, as a lecture
outlasts the screen's timeout, and a call pauses it. The camera stops in the background,
which ends a video recording and saves it. The simulator records video from a stand-in
camera.

Assisted-by: claude-opus-5.5