If you are unable to see your bookmarks in Estimator, open the PDF and make sure you have data under the BookMark tab and not the Thumbnails tab.
Note: Estimator doesn't have the capabilities to edit or modify bookmarks once they are uploaded, that change has to be done in a PDF editor and reuploaded.
Thumbnails
Bookmarks
You can also reference the link to see how to do this in Bluebeam - Bluebeam bookmarks link