What's the best way to add audio to Google Slides automatically?

The most reliable approach is to generate narration from script and sync audio at the slide-section level.

Automating this well means avoiding one long audio track across the full deck. Section-based clips are easier to update and keep aligned with visual changes. If one slide changes, you regenerate one clip instead of replacing everything.

Start with a clean script per slide, focusing on one key point per segment. Then generate voice output and attach clips in sequence. Keep a short gap between clips so transitions feel natural and not abrupt.

For teams sharing decks externally, publish as a single watch link rather than sending editable internal files. This protects structure and delivers a consistent viewing experience.

If your deck changes weekly, pick a workflow that supports partial regeneration and version tracking. That is what keeps automation useful beyond the first publish.