I'm playing with both the iOS and Kindle Fire (Android) versions of the Logos app.
When highlighting text using the iOS app, once I select a note document to contain the highlight, subsequent highlighting entries automatically default to that same note document unless I change it.
When highlighting text using the Kindle Fire (Android) app, it always defaults to the "Emphasis Markup" note file (I'm using a blue underline). I have to re-select the notes document I want for each and every highlight entry I make.
I've looked for a way to change this behavior on the Kindle Fire, but haven't found one. Am I missing something?