A team updates its project brief, but an AI summary still describes the previous deadline. Before rewriting the prompt, check which version of the document the notebook actually contains.
For a small team, the useful distinction is how a source entered the notebook: through Google Drive, as an uploaded file, or as pasted text. That choice determines what you should check when the original changes.
This guide combines current official documentation with a suggested review workflow. It is not a hands-on product test. The Help page checked on September 11, 2026 displays “Gemini Notebook”; the earlier Google announcement uses “NotebookLM.” We use the latter name here to match that announcement, without assuming identical screens across accounts or devices.
What the official documentation says
Google announced automatic Drive syncing on May 26, 2026. The announcement describes supported Drive documents updating as their originals change, replacing the earlier manual refresh workflow. Google Workspace announcement
The current Help page says Drive imports sync every few minutes and update when a notebook is opened. It also offers a manual sync control. Losing access to a Drive file, or deletion of that file, makes the source inaccessible; inactive sources still count toward limits. Google file comments and footnotes are not imported. The page flags mobile limitations. These are documented behaviors, not timing or device guarantees tested by SELVETH LABS. Google source Help
Choose the source route deliberately
Use this table as a planning aid. The recommendations in the final column are our proposed workflow.
| Source route | What to distinguish | Suggested update check |
|---|---|---|
| Supported file imported through Drive | A linked source with documented syncing | Compare one changed passage in the original and source viewer before relying on a new answer. |
| File uploaded from your device | An imported copy; do not assume the Drive sync promise applies | Check which revision you uploaded. If it is outdated, prepare the current file as a new source and verify it before retiring the old copy. |
| Text pasted into a source | A copy of the selected text | Keep the original location and revision date in your own record; prepare a new source when the excerpt changes. |
The Help page describes sources as copies or synced versions. It does not establish automatic refresh of local uploads or pasted text from their originals. The cautious handling above is a recommendation based on that distinction, not a claim that every file format has been tested. Google source Help
A Drive folder containing documents is also different from an individually imported source. Do not assume that adding one document subscribes the notebook to every future file in the folder.
A five-step update check
The following is a proposed team process. Its effect on speed or accuracy has not been measured.
- Name the intended revision. Record the source title, original location, revision date, and the question you need answered. A title such as “Project brief” alone is not enough to distinguish two copies.
- Inspect the source route. Establish whether you imported through Drive, uploaded a file, or pasted text. Avoid changing several copies at once while diagnosing a mismatch.
- Verify a changed passage. Choose a small, consequential change you can locate in both places—for example, a delivery date or a product exclusion. Compare the actual text, not just filenames.
- Ask a fresh, narrow question. After checking the source, request the relevant fact again and inspect its supporting passage. Treat an earlier saved summary as a separate output to review; do not assume it has been rewritten because the source changed.
- Record the disposition. Mark the result ready, needs correction, or waiting for source access. Keep the unresolved point visible to whoever will use the summary.
This process checks a specific claim. It cannot establish that every statement in a long report is correct.
Worked example: a revised project deadline
Imagine a fictional team changing a brief from September 18 to September 25. This example is illustrative, not an observed product result.
The reviewer first checks the authorized original and confirms September 25. Next, they inspect the notebook source. If it still shows September 18, the source check remains incomplete. They follow the appropriate update route rather than editing the final report to hide the mismatch.
Once the source shows September 25, they ask: “What deadline does this brief give, and which passage supports it?” They compare the answer with the source, then correct the separate report if necessary.
| Check | Example record |
|---|---|
| Intended source | Project brief, revision September 11 |
| Material change | Deadline changed from September 18 to September 25 |
| Source check | Enter the date actually observed in the source viewer |
| Answer check | Enter the date and supporting passage actually returned |
| Disposition | Ready only after both checks agree; otherwise record the mismatch |
| Reviewer and review time | Enter the responsible person and actual time |
Do not prefill the observed fields with the expected answer. An incomplete record is more useful than a confident-looking record that conceals an unchecked step.
When access disappears
If the source becomes unavailable, pause claims that depend on it. Ask the document owner to confirm the intended access or provide an authorized current source. Do not solve an access problem by making the document public.
Also distinguish an unavailable source from information copied into a separate report. Review those downstream outputs independently rather than assuming that their content has disappeared or become current.
Before sharing the result
Check the original revision, the source used, the supporting passage, and the separate output you intend to share. Record any unavailable source or unresolved mismatch alongside the affected claim.
You do not need to add a tool subscription or extension to adopt this review process. This article makes no affiliate recommendation and includes no tested savings or accuracy claims.
Documentation checked September 11, 2026. This is a documentation-based guide with a proposed workflow and fictional example. Live sync timing, account-specific interfaces, mobile behavior, and workflow effectiveness were not tested.