As for the additional support for more file types, you can now upload Google Sheets, Drive files as URLs, PDFs from Google ...

Google plans to do it by helping users find and use resources more effectively. To make it easier to find sources, NotebookLM ...

Deep Research finds the sources, but you can pick what to keep or even direct it to specific sites as it builds your report.

Google is upgrading its NotebookLM AI research assistant with Gemini's 'Deep Research' capability and new support for Google ...