The steps
- 1Sign in to admin.google.com with the Google Voice Admin role.
- 2Go to Apps → Google Workspace → Google Voice → Settings.
- 3Open the Hold Music section and click Add Audio.
- 4Choose Upload Audio File (or Text-to-Speech), preview, and Save — it applies to every licensed user in your domain.
Format gotcha
There's no per-user option — hold audio is domain-wide. And on personal Google Voice, the only “hold music” is a fixed default you can't change.