You're able to pass canned ACLs to putObject and putObjectFile, but there's no way to set an existing file's canned ACL. You have to set an AccessControlPolicy (which is more complex). You can see a sample canned ACL for an existing object at the end of this link https://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectPUTacl.html
You're able to pass canned ACLs to putObject and putObjectFile, but there's no way to set an existing file's canned ACL. You have to set an AccessControlPolicy (which is more complex). You can see a sample canned ACL for an existing object at the end of this link https://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectPUTacl.html