Can I add audio to individual image files?

Yes, you can. To do this you first need to drag-and-drop a photo image from the "Compilation area" (the big screen which may hold many image with blue frame) down to the "Sorter & Viewer area" (the filmstrip located at the bottom of the screen). Then go to the "Effects" mode by clicking the on the "Switch between the Edit & Effects mode" button (located at the top right of your screen). Then click on the "Audio Effects" button to specify the audio file name you want to add.