1. Log in to the Calltech school account on the web app.
2. Click on the announcement audio.
3. The cursor is passed over the row of the student's data for which you want to change the call sound.
4. Click on the Upload MP3 file.
5. The announcement audio pop-up will appear.
6. Click on Upload MP3 File.
7. You can listen to the audio file before saving the changes by clicking on the play audio button.
8. Click on Save Changes.
