Adding Sound/ Audio
- Click the down arrow next to Annotate
- Select the Sound tool
- Click on the page of your document. In the menu which appears either record a note or annotation by clicking the red record button, or select a file on your computer which you have previously recorded.
Once added, click on the sound/ audio annotation icon on the page to listen to the recording.
Note: Not all PDF apps support audio annotations. A PDF re-saved in an app without support for this feature will erase the annotations. This includes Preview in El Capitan and earlier.