When you have a situation where you want to assign a few policies on a temporary basis to an IAM user, roles are created from the AWS console with added permission to access/process certain functionalities in the form of policies. These are called as assume roles.
The assume role creates ARN which helps to generate temporary security credentials. A set of temporary security credentials are returned that can be used to access AWS resources. These temporary credentials consist of an access key ID, a secret access key, and a security token.
To access the resources through ARN you have to make sure that the resources are mapped and the policy is attached to the user.
You can find the ARN ID of the role from the Roles dashboard on the AWS console.
This ARN ID can be used in the Studio to configure the AWS Auth connector. This will generate temporary credentials for the user operating the connector accessing the AWS resources.