The fastest way to add your files to a Sagan is by dragging and dropping those files directly into your browser window when your Sagan is open. This will automatically add them to the location in which you've dragged them, as well as making them into Knowledge Items (KIs) which will be added to the KI Palette.
To add desktop files, you just need to drag them into the browser window.
It takes anywhere from a few seconds to a few minutes for the Cover Image to become clear, depending on the size of the file.
To add URLs, copy the address from the link's browser window and past it into the Sagan browser window.