If the file is not an mp3, convert it to one:
- After saving your file in Quicktime (or other software), locate the file wherever you saved it.
- You will see that the file looks like "FileName.m4a".
- Right click it and choose Open With > choose iTunes
- Locate the file in iTunes Library > Select it > click File > Convert > Create MP3 Version
- Your new sound file will be located in you home folder > Music > iTunes > iTunes Media > Music > (probably "Unknown Artist"
- Navigate to the newly converted file mp3 and upload it to drive.google.com through Chrome:
- Then, open Google Drive in Chrome. If you would like to save the audio file in a particular folder on your Google Drive, navigate to that folder.
- Drag and drop the mp3 file from your computer onto your your Google Drive webpage. This will save the file to your drive.
Open your Google Slides presentation. On the menubar at the top of Google Slides, click "Insert" and select "Audio.
You should see your audio file in the list. If not, you can search for it. An audio file only works on a single slide.
The audio will only play for people who have access to the file in Google Drive, so you must share the audio file separately with anybody that will need to hear it.