AWS S3 Transfer Manager ${cognito-identity.amazonaws.com:sub} Policy Variable Access Denied
问题 I am trying to download a file from AWS S3 to my iOS mobile app from a folder that is specific to the user, using Transfer Manager, like so: @IBAction func download() { let transferManager = AWSS3TransferManager.default()! let downloadingFileURL = URL(fileURLWithPath: NSTemporaryDirectory()).appendingPathComponent("disney1.jpg") let downloadRequest = AWSS3TransferManagerDownloadRequest()! downloadRequest.bucket = "sidestreamx" // user's UUID/disney1 downloadRequest.key = "631d121f-b294-4318