on Change lets me detect when they choose a file, but I would also like to know when they cancel (close the file choose dialog without selecting anything). in both cases. That is, it is triggered by a click either on the Open spacebar clicker button or on the Cancel button in the File Dialog. The change event is triggered a few milliseconds after the Open button is clicked. It is never triggered if the Cancel button is clicked. The cancel event is also fired when the file picker dialog gets closed, or canceled, via the "cancel" button or the escape key

Slide Pack OF — Two Quick Questions" is not a standard phrase. It is most likely a title or instruction for a business meeting, training session, or presentation. The phrase indicates the creation of a presentation file (a "slide pack") with specific content: "two quick questions". It suggests that each slide should have no spacebar counter more than seven lines of text, with each line containing no more than seven words. This rule aims to keep slides concise and easy to understand. This is a simple way to show gratitude that the audience took time to listen. Clean has a pre-built slide to thank the audience for their attendance.