Yes, you are able to do this and it is very straight forward to do so. Also, when adding damage to a rack and you forget to add an image or note, you are also able to add an image or note in the same way.
On the inspection screen, tap on either Image or Note on the Damage Classification card.
If you tap on Image, you will be taken to the image gallery screen where you will be able to add an image by tapping on one of the 2 buttons in the bottom right hand corner. To also add a Note, swipe right or tap on the Note header at the top left. Tap back and you will you be taken back to the Inspection Screen with your image and note added to the existing damage classification.