Help! All the photos I took with my camera360 app have disappeared after iOS update. I backed up my phone. How can I extract the photos?

After updating my iOS, I lost all the photos from my recent holiday taken with the Camera360 app. I backed up my phone before the update, but even when I restore my phone with the backup, the photos aren't restored. Other apps seem to have my data and preferences saved fine though. Is there a way I can extract the photos in Camera360 from my backup? When I look inside the backup files, I don't recognize any of the file extensions. Please help!