Cycle through your annotations with the next / previous buttons in the annotation toolbar (top right of the document viewer), or press Tab. Each click or tab press jumps to the next annotation.
You can also open the annotations tab in the left panel to see a list of every annotation on the document and jump straight to one.
Use the filter icon next to the next/previous buttons to show only certain annotation types.
When you reach the last annotation in a document, you can start over at the top of the current document or continue into the annotations of the following documents.