What are Annotations?
Annotations help developers bring a whole new level of collaboration to their apps. With annotations, end users can collaborate on a file without having to leave the app or print out files in order to mark up or highlight them.
Annotations allow users to highlight text and comment on specific areas of a file rendering, such as a particular area of an image or on a particular slide of a presentation. Once enabled, your users will see options to add annotations in the header bar of the embedded file viewer using the Get Embed Link endpoint of the Box Content API. You can easily enable annotations by adding a query parameter to the embedded file URL.
See the Demo App