UNITY apk to big for google play? (download my content from my server?)

hey gang my game apk is to big for google play, (eg if my game is like 800mb…)

I see Other games you download the game then the game downloads the rest of the content from a server, is their any tutorials to do this with unity?

I have a website and server so I’d be able to set this up.

I, don’t quite know but don’t AAB files reduce the size or something.