Logged in users can upload but not list files

Describe the bug

I have a react app that is able to upload files to S3, however when trying to list files, the pre-flight OPTIONS request succeeds, but the actual list gets a 403.

The IAM role for the cognito user is:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Action": [
                "mobileanalytics:PutEvents",
                "cognito-sync:*",
                "cognito-identity:*"
            ],
            "Resource": "*",
            "Effect": "Allow"
        },
        {
            "Action": [
                "s3:*"
            ],
            "Resource": [
                "arn:aws:s3:::dev-drop-bucket-files/private/${cognito-identity.amazonaws.com:sub}/*",
                "arn:aws:s3:::dev-drop-bucket-files/private/${cognito-identity.amazonaws.com:sub}"
            ],
            "Effect": "Allow"
        }
    ]
}

Here’s a sample of the code that is what I’m using for the uploads/downloads:

import { Storage } from "aws-amplify";

export async function s3Upload(file) {
  Storage.configure({ level: 'private' });
  const stored = await Storage.vault.put(file.name, file, {
    contentType: file.type
  });

  return stored.key;
}
export async function listFiles() {
  Storage.configure({ level: 'private' });
  const files = await Storage.list('/');
  return files;
}

Expected behavior

List should return a list of files.

Desktop (please complete the following information):

• OS: MacOS
• Browser Chrome
• Version 71.0.3578.98

[manueliglesias]

@marksteele can you try:

Storage.list('', {level: 'private'})

[github-actions[bot]]

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