RapNet automatically connects image files in your Media Library to your diamonds if the image file name matches your stock or certificate number.
Example: Diamond Stock number = BR1000, Image file name = BR100.jpg
To connect multiple images to one diamond, suffix each save filename with either with either a add a dash or underscore AND a number.
Example: BR100_1, BR100_2, BR100_3 or BR1000, BR100-1, BR100-2, BR100-3
Read this article for full guidance.