Cannot resolve anything in com.dropbox.core.android

I'm currentliy integrating Dropbox into my app. I started with the desktop version, which worked flawlessly.

But now on Android I'm having problem to set everything up. I wanted to use the OAuth flow using the Dropbox app to authenticate. But all the content of com.dropbox.core.android seems to be missing. So e.g. th class com.dropbox.core.android.Auth cannot be resolved. Same for the AuthActivity.

I just added the Dropbox (and kotlin as I wasn't using it before) dependency to my build.gradle and synced gradle:

```
implementation 'com.dropbox.core:dropbox-core-sdk:5.4.4'
implementation 'org.jetbrains.kotlin:kotlin-stdlib:1.7.20'
```

All the other classes are there, just the content of android isn't.

Am I missing something? There is just this library? No dedicated Android library, right?
Thanks for helping!