How does the iOS app select which document to use for notes and highlights? The app has an uncanny ability to know which document I want to use for a highlight - and automatically selecting a different document. I can make a highlight, switch documents for that highlight, then when I go to make another highlight it's back to the first document. Come back to the app later and it's switched which document it uses - but by then I'm wanting to use a different one altogether.
Desired behavior would be for the app to remember the last-used document. If I make a highlight and switch documents, the next time I highlight something it should show the document I selected for the previous highlight.