Extended applications of multimedia content previews in the cloud-based content management system

摘要

Systems for providing previews of files stored in an online content management system with collaboration environment and permitting a user to annotate the previews on a transparent layer, the annotations preferably being stored separate to the previews and the files. The system further tracks the frequency of access of content in previewed documents and provides a visual representation, such as using a duration map, of the frequency with which sections in a document was viewed.