By default, basic file information about the photos you are about to import into Aperture is not shown in the Import browser. However, you can set Aperture to show this information.
In the Import browser, choose File Info from the Import Settings pop-up menu.
Basic metadata about the file selection appears above the Aperture Library controls in the Import browser.

Note: If the selection is a movie or audio file, the duration is shown as well. When a photo with an attachment (such as an audio annotation) is selected, the duration of that attachment is displayed.