Yes - that is exactly what DocEvent is. Point a service at the Amazon S3 bucket, Azure Blob container, Google Cloud Storage bucket or any S3-compatible store (Cloudflare R2, Backblaze B2, Wasabi, MinIO) you already use, and it becomes reachable over SFTP, FTPS and FTP. Files land directly in your storage under your own credentials - nothing is stored on our servers.