Importing a test used to mean clicking through an upload dialog first. Now you can just drop the files straight onto the page.
Drop one or more files anywhere on your Tests page and they become a new imported test — in the folder you have open, if any. Drop them on your Source materials page instead and each file becomes its own source material. A row appears at the top of the list with a progress bar, so you can watch the upload and the import happen while you carry on with something else.
It works with the same formats as before, from Moodle quizzes and QTI packages to PDFs.