Hey, I'm on the Wing team, yes you are correct, cloud services, like object storage, are indeed first class citizens and you can use them as naturally in Wing as you would use basic data structures or OS services in traditional languages.
The idea behind Wing is that the cloud is the computer that it targets. By having a compiler that sees the entire application, including infra and runtime code, we are able to delegate cloud mechanics (IAM policies, network topologies, etc.) to it instead of leaving these details for developers to take care of and reduce their velocity.