Answered
I have many GeoGebra worksheets stored as personal resources at GeoGebra.org (used to be GeoGebraTube, I guess). I can insert them into a page in GeoGebra Notes if I first download them locally. Is there any way to directly insert them from my Resources folder?
The same question 
Use the input option 'web' and paste the url of the resource in the dialogue
chris
Ah, shoot. I wasn't thinking and tried to load a book, not an activity, getting just an empty box. Once I got a link for an activity, everything worked just great.
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