Troubleshooting Dovetail's Highlight Suggestions for Google Doc Notes

Hi dovetail team! I created a new note in a project with Suggest highlights turned on — it's pasted in directly from a Google Doc (about 4 pages long, summary of a customer feedback call in bullet points). The AI generated a summary just fine, but when I try to generate highlights, it just says “No highlights found. Please try again.” What could be the reason why it's not suggesting highlights in this case?