Any reason why when I upload a set of books to NotebookLM and have an interesting conversation about them with NotebookLM, the conversation is not stored? I can't revisit it later, I can't continue from there. I don't understand why they changed the UX/UI from the other AI solutions (Gemini or GPT).

I also don't get why NotebookLM refuses to write things either, I can't make it write an essay based on the information I fed through PDFs or other files.

Somewhat related, I also find it bizarre that they all but prevent you from getting information out of the app. Export to/Open in Google Docs seems like a no-brainer, but copy-paste is the only option.