Intellij idea grails

Hello,

I'm starting a new project, with grails 3 for the server and react-native for the client.

I'm using intellij ultimate.

gradle is configured as a multi-project build where the "server" module contains the Grails application and the "client" module contains the react-native application.

I have a few questions :

1. How to import those projects ? I have tried to follow the 'gradle import project' on the jetbrains documentation, but I face numerous errors. Maybe I'm missing global settings for it to work. Can I get a detailed step by step instruction on what I need to do please?

2. Can I see both the client and server in a single intellij instance, or must 'client' and 'server' be 2 different projects, on two different intellij instances?

Thanks