Loading an asset from cloud after target image is found

Hello, I am still very new to working if Vuforia. 

I have a simple test app that loads a 3d model from amazon s3 using a simple script. It's nothing fancy but it get the job done for a first attempt.

I currently have my test app working but I wanted to see if it was possible to load my assets after the image target was found. Right now I start loading my assets at run time. Every time I test it, I keep hitting a wall and it got me wondering. Will Vuforia still register the image target if there is not child object attached to the image target in unity? If so, how do I make my script run after the image target is found?