Hi, Thanks for the compliments, I am glad you are enjoying the application. There is no fixed maximum file size or maximum number of events, however the performance of the application will slow down when using a very large number of events and entities (the amount will also depend on your computer). Our next update for the application does include improvements in this area, so that the program will be more efficient for a large amount of events than before. Our data is currently stored as an xml file, with the next update converting to JSON file, a database backend is not our roadmap to implement. The ability to import images and documents is also included in our next update. Drag and dropping images is not included yet, however is something we will consider in the future. Jess