Reducing application size

Hi, we created a mobile application based on Unity and Vuforia with AR, but it weighs too much because of the images that are shown in augmented reality. How to connect to the application a cloud so that it works like a Google map, where you need to either download cities or have an Internet connection?

We have a $99 subscription to Vuforia, where there is a cloud, but it only concerns tags and will not help us.