Any document in your pack that you have marked up will have an orange ‘pen’ on the document thumbnail to indicate your notes are present on that document.
You can review a list of all your notes from the ‘Annotations’ menu.
When you click on a listed annotation, you will jump directly to that location in your pack.
See also
Add Notes/Annotations on the Board Pack
Find your Notes on a document
Find Previous Copies
Notes/Annotations Destruction Policy