Asset Bundles Not Loading "Unable to open archive file: res://purpleroom"

Hey all! I'm fairly new to Unity, and I have an application with different "rooms" (which is really just different textures and music being applied to objects). Recently, Apple rejected my build because my resources were too large (increasing the overall app size). So they told me to do some "App Thinning". So I followed the "App Thinning" tutorial at "https://docs.unity3d.com/Manual/AppThinning.html". Now all my room textures are in separate folders, labeled with AssetBundle tags, and I have run the "BuildiOSAssetBundles" to generate the manifests to the ODR folder. Where I'm getting lost is at the "LoadBundle" script. I see that it is a MonoBehavior script that is set up to load an AssetBundle by tag, but how do I use it to actually retrieve the items from my asset bundle? I'm so lost here. Please help if you can! Apple won't let me upload until my app is small enough.