How does AugmentedImage.unity scene works in ARcore?

I was trying to do AugmentedImage in Arcore. Lack of tutorials for that.What I did was created a Augmented Image database with all the custom images I had given.The part I struggle is where I got 20 images.For each image a particluar model should come.Please have look at below link.https://stackoverflow.com/questions...age-sce?noredirect=1#comment94193239_53455908