Using Addressables to download additional data files on iOS and Android

Hi,

I have a PC game I'm porting to iOS and Android and the ported build (for iOS) is 12GB which is more than the 4GB limit for an app size. I believe the solution is using Addressables to move a lot of that data as a separate download file that is hosted on google drive or similar is the solution. However, I'm struggling to find a good tutorial on how to do so and to understand a few key aspects.

Does anyone have a good tutorial on how to replicate the expansion file process (in Android) with Addressables and / or setting up a scene that downloads the expansion data from a hosted location?

Also, if I do add a scene that loads a file with the bulk of my game data at one time, after that does the rest of my game code work as it currently does or do I need to replace instances of Resources.Load and Instantiate with the Addressables Async version in the code?

Any tips would be greatly appreciated.