Add a YouTube channel
Notebook Clipper adds the videos of a YouTube channel to a notebook in Gemini Notebook (formerly NotebookLM), one source per video, transcript included. It reads the channel’s Videos, Shorts and Live tabs. Videos already in the notebook are skipped, so adding the same channel to the same notebook again never creates duplicates. The channel must be public.
Add the channel
There are two ways to add a channel to Gemini Notebook.
Click Add to Gemini Notebook in the channel header
The button sits after Subscribe. The extension first fetches every video in the channel; a notification shows the progress, and large channels take a while. The Add to Notebook dialog opens when it is done.

Select a notebook
Choose a notebook in the Add to Notebook dialog, or click New notebook to create one. If every new video fits, they are added right away and the dialog closes.

Select the videos, if asked
If the channel has more new videos than the notebook has room for, the dialog asks you to choose. Select the videos you want.

Click Add to notebook
The button is at the bottom of the dialog. If everything fitted at step 2, the videos are already in and there is nothing to click.