Is it possible for Region A CloudFormation to access Region B S3 bucket?

To upload folders and files to an S3 bucket, log into the AWS Management Console and go to the Amazon S3 console at https://console.aws.amazon.com/s3/. Through the left navigation pane, select Buckets. Hover to the Buckets list and select the name of the bucket that you would like to add your folders/files to. Then click on upload.

First, you need to utilize the Amazon S3 console to see the properties of one of the objects that you are not able to access. Then review the object's Encryption properties. If the IAM identity is lacking permissions to any of these actions, then you should modify the key policy so that you are able to grant the missing permissions.

Amazon S3 is an online backup and storage system for Amazon. It ensures optimal security storage for various types of files, including photos, videos, audio files, and documents. You can easily store and retrieve data of any size from anywhere on the internet and access it easily.

These are the different ways to share S3 buckets across accounts:

• You can create a cross-account IAM role, which allows another AWS account to assume that role and gain access to the S3 bucket. This approach works well when you need to offer precise control over access, like read-only permissions or access to a specific folder within the S3 bucket.
• You can create a bucket policy that allows another AWS account to access your S3 bucket. This approach is beneficial when you want to provide wide access to the S3 bucket, such as the ability to read and write all objects within it.
• By using S3 Access Points, you can create access points and shareable S3 buckets. Access points enable you to set precise permissions and network controls for shared access. This approach is useful when you want to share specific portions of the S3 bucket with other accounts.
• If you have multiple AWS accounts organized under AWS organizations, you can utilize the AWS Resource Access Manager (RAM) service to share S3 bucket across those accounts. This approach permits you to share resources between accounts without creating IAM roles or bucket policies.

A few S3 limitations when using KMS are:

• Key policy limits
• Buckets are not stackable
• It is not adjustable