The AWS administrator must set S3 access policies to grant users the required access to S3 resources.
Perform this task in the following situations:
You are integrating for the first time.
S3 access policies allow control of user access to S3 resources and the actions that users can perform. The AWS administrator uses policies to control access and actions for specific users and resources, depending on the use case that mappings and workflows require.
AWS uses a JSON statement for S3 access policies. To set the S3 access policy, determine the principal, actions, and resources to define, then create or edit an existing S3 access policy JSON statement.