When you have several files in a single session, you should be able to generate notes or summaries that draw from all sources (or only a few that can be selected by the user), so that you can immediately have a clear view of what you need to study. If the topics were too many then it would first be necessary to generate a list of topics from all sources (or those selected), with the possibility of modifying and adjusting any errors (for example if two documents talk about the same topic but the AI does not recognize them as equal then the user himself can merge them or manually specify from which pages and which documents to rely on the sources). In this way, it would be possible to obtain really well-done notes with the highest degree of detail.