I’m reading a book and highlighted something in the book and created a note regarding the highlight. Now I want to add another anchor to the same note from a different passage in the book.  For the life of me I can’t figure out how to do it on mobile. 
I can select the text but I can’t figure out how to send that reference as an anchor to an existing note. I also don’t see a way to anchor the selected text or something like that. 
Someone please help me!