Adding TTS for slide with bullet points

I don't know how exactly you are planning to use your bullets in a slide. What can you do is to add TTS for all content that you can split in to more text boxes with bullet points in the timeline and show them one by one as TTS progress. You could also add more TTSs for every single bullet but that you would have to consider using more triggers in this case in order to stop one TTS and play the next TTS so they don't overlap each other. I have attached a few screenshots and a sample story file. If you are new to Storyline I strongly suggest reading this article about Text-to-Speech https://community.articulate.com/articles/storyline-360-converting-text-to-speech. Hope someone else with more experience in this topic will jump in to advise.