To add a voiceover to a slide, click on the microphone icon at the bottom of the open slide and hold.
You may be prompted by your browser to allow permissions to access your microphone.
The voiceover will record for as long as you click and hold on the microphone icon . You will see a timer recording your voiceover. You will be prompted to "Keep it short" at 10 seconds and CC Express will not record voiceovers longer than 30 seconds.