A notebook with a pile of PDFs, webpages and documents can produce a broad answer when you wanted one precise comparison. NotebookLM lets you control the source set and ask a narrower question using the names of the sources you want it to focus on.
Start with a deliberate source list
Open a notebook and choose Add sources. Select the files or web sources that belong in that project instead of importing everything by default. If you bring in Google Drive files, the help documentation says supported sources can sync with changes to the original document. Check which version appears in the notebook before relying on a recently edited file.
When several sources are selected, mention their names in your prompt. For example, ask for the differences between two named reports rather than simply saying “compare these.” Google’s source guide explains that a focused question and source names help NotebookLM narrow its response.
Check the evidence behind the answer
NotebookLM can generate summaries and answer questions from sources, but it can still misunderstand context or omit an important caveat. Open the citations or source references attached to the answer and confirm the original passage supports the claim. For high-stakes research, verify numbers, dates and quotations directly in the document.
Also make sure you have permission to import the material. A source in Drive may be available only when you have at least view access, and access can change if the owner removes it or deletes the file. Do not upload confidential work documents unless your account and organization’s rules allow it.
A clean source list does not guarantee a perfect answer, but it makes the notebook easier to reason about: fewer unrelated files, clearer questions and a faster path back to the evidence.
Featured image credit: Bruce Turner from AustinTX on Wikimedia Commons — CC BY 2.0 (license).
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