Is it possible to use several different documents in one mindmap? If so, how do you indicate what mindmap to add highlights to?
Yes - in the iPad or Mac app when you’re in mindmap mode / study mode, on the top right is the “manage” button, where you can add additional documents to your current mind map. When you do that, it creates another separate mindmap of the added document so you’ll have 2 tabs, and 2 mindmaps in one mindmap document. When you add highlights to any document, it adds the excerpt/highlight to the respective mindmap