- Detailed analysis of supported formats and technical limitations for uploading documents to NotebookLM.
- Strategies to mitigate AI hallucinations and improve the accuracy of responses through source selection.
- Advanced use of the Discover Sources feature to optimize automated web and Google Drive research.
If you've decided to try NotebookLMYou'll know it's a Amazing tool for organizing ideasBut sometimes it can give you a headache. It's not uncommon to feel like the AI is hindering you when uploading a lot of files. You are not reading all the content or that they skip entire sections of your documents, leaving you with answers that don't quite fit together.
To truly get the most out of this smart notebook from Google, simply uploading files isn't enough. You need to understand that we're dealing with a system that reinterprets the information and not just a keyword search engineThis means we must know its limits to avoid making mistakes during our research.
File types and limits you should know
For NotebookLM to run like clockwork, the first thing to know is what it can handle. The platform accepts a huge variety of formats: from Google Docs and Slides (these last ones up to 100 slides), up to spreadsheets with a limit of 100.000 tokens. You can also It can handle Word (docx), PDF, Markdown (md), plain text (txt), CSV, and PowerPoint (pptx) files..
If multimedia content is your thing, you can import YouTube URLs (provided they are public videos with subtitles) and audio files such as MP3 or WAV, which the AI will automatically transcribe. It also supports images in common formats like JPG, PNG, or WebP, although some may present more problems than others. Regarding capacity, each source can hold up to 500.000 words or 200 MBand you can have a maximum of 50 fonts per notebook.
One important detail is that NotebookLM creates a static copy of what you upload. This means that if you change the original file on your computer, the font in the app won't automatically update. In the case of Google Drive, you'll see a button for the document, but keep in mind that footnotes and comments aren't imported, and content from sub-tabs in spreadsheets is usually excluded.
The problem of hallucinations and veracity
This is where many people get stuck. It's important to understand that NotebookLM doesn't copy and paste, but rather... Write based on the context through the RAG system. This can cause AI to smooth over contradictions or, worse, generate incorrect conclusions to fill in gaps when it cannot find the exact information in your sources.
When you handle a very high volume of data, the risk of error skyrockets. The tool attempts to synthesize and prioritize, and in that process it can mixing concepts or eliminate critical nuances. Therefore, if you notice that the AI tells you there are 7 sources when you've uploaded 10, it's likely experiencing a limitation in the context window or due to a statistical probability error.
To avoid these mistakes, the best tactic is work only with the active sources you need for each queryDon't select the entire notebook if you only need data from two books; mark the sources individually in the side panel. Also, instead of asking for generic summaries, ask questions mentioning the exact document title so the AI can narrow the search and avoid guessing.
How to master the Discover Sources feature
If you're short on material, you don't need to spend hours on Google. NotebookLM includes a Discover Fonts button which is a real gem. This feature lets you search for content directly from the web or scan your own Google Drive to find files you may have forgotten about but that are vital to your project.
When using the Discover Sources feature, The AI provides you with a list of results, a summary, and a link.If you need something more professional, Deep Research mode can analyze hundreds of websites and generate detailed reports in just a few minutes. allowing you to import only what you really needFor best results, try to be specific, using technical terms or narrowing down by dates.
A useful trick is to repeat the search, varying the keywords or the language. Although the free version usually limits the number of sources discovered per run, You can repeat the search as many times as you want. until you fill up your notebook. It's the fastest way to put together a theoretical framework without going crazy with open browser tabs.
Troubleshooting common technical problems
Sometimes technology can be stubborn. Some users report that when they try to add fonts, the page freezes. loading infinitely Despite having a fiber optic connection. In these cases, the most effective and quickest solution is usually to manually refresh the tab or reload the page, which forces the application to recognize the uploaded file.
Another critical point is the use on mobile devices, where some Source management functions may be limited or unavailableIf you notice that the app isn't responding as it should, it's best to perform the major font configuration from the desktop version and then use the mobile app only for quick queries.
Taking everything into account, it is clear that NotebookLM is a very powerful assistant, but it requires human supervision.The key to avoiding the trap of plausibility is to treat AI as a support tool and not as an absolute truth, always verifying crucial data with the original source and using only well-organized and correctly uploaded documents.
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