Check S3 File Exists
Checks if a file exists on S3.

Input
S3 Check Exists
| Name | Required | Description |
|---|---|---|
| Connection | AWS Connection. | |
| Bucket | The name of the S3 bucket where the file exists. | |
| Object Key | The key name for the file within the S3 bucket. e.g. prefix/file-name.file |
Output
Exists True if the file exists, false otherwise.