We have pushed a fix for this behavior, which will be available in the first internal build after the official release from yesterday. It would allow disabling the widget in the select event
handler, which will be useful in a combination with the async.autoUpload
option set to false. This will not allow the user to start the file upload until a description is given (afterwards you should enable the widget again).
I hope this information helps. Have a great day!
Join us on our journey to create the world's most complete HTML 5 UI Framework - download Kendo UI