I upload long documents to NotebookLM a lot, but a 500-page PDF as a single source gives shallow results. This tool splits it at headings and uploads each part separately, so the reports and quizzes actually go deep into each section. The main thing it solves is the quota problem. You can queue 170 Studio jobs, get blocked at job 40, come back tomorrow and retry. Pick a PDF, set chunk size, skip the preface if you want, review everything, sync, and manage the queue from one screen.