You can add video and audio—a music file, a playlist from your iTunes library, or a sound clip—to a sheet. Click the Play button on the video or audio in the spreadsheet to watch or listen to it.
Note: Video and audio files must be in a format that QuickTime supports on your Mac. If you can’t add or play a video or audio file, try using iMovie, QuickTime Player, or Compressor to convert the file to a QuickTime file, in MPEG-4 audio or H.264 (720 p) video format.
Do one of the following:
Drag a media file from your computer to a media placeholder or to anywhere else on the sheet.
Click 
in the toolbar, click Music or Movies, then drag a file to a media placeholder or to anywhere else on the sheet.
To search for media, click the magnifying glass in the upper-right corner of the media window.
Play video: Click the movie, then click 
.
Play audio: Click .
Select the video or audio on the sheet.
Click the Movie or Audio tab at the top of the sidebar on the right.
If you don’t see a sidebar, or the sidebar doesn’t have a Movie or Audio tab, click 
in the toolbar.
Click Replace.
Select a video or audio file, then click Open.
Select the video or audio on the sheet.
Click the Movie or Audio tab at the top of the sidebar on the right.
If you don’t see a sidebar, or the sidebar doesn’t have a Movie or Audio tab, click in the toolbar.
Click the disclosure triangle next to Edit Movie or Edit Audio, then drag the Trim sliders.
You can choose the frame that’s displayed on a sheet to represent the video.
Select the video on the sheet.
Click the Movie tab at the top of the sidebar on the right.
If you don’t see a sidebar, or the sidebar doesn’t have a Movie tab, click in the toolbar.
Click the disclosure triangle next to Edit Movie, then drag the Poster Frame slider.
Select the video or audio or on the sheet.
Click the Movie or Audio tab at the top of the sidebar on the right.
If you don’t see a sidebar, or the sidebar doesn’t have a Movie or Audio tab, click in the toolbar.
Drag the volume slider.
You can set a preference in Numbers to optimize images and movies for viewing on iOS devices. This setting ensures that large images look clear on iOS devices, even after scaling, and it converts movies in your spreadsheets to H.264 (720p), so they play well on iOS devices.
Choose Numbers > Preferences (from the Numbers menu at the top of your screen).
Click General at the top of the preferences window, then select the checkbox next to “Optimize movies and images for iOS.”
If your spreadsheet uses image, audio, or video files, you can reduce the Numbers file size by downsampling image resolution to Retina quality and deleting unused (trimmed) portions of movies and audio.
Choose File > Advanced > Reduce File Size (from the File menu at the top of your screen).