Files.com mounts the Amazon S3, Azure, or Google Cloud bucket you already run and serves it over SFTP, FTP, FTPS, and WebDAV, with the access control, automation, and audit trail object storage never had. Your data stays in your bucket, in your region. Nothing is migrated, and nothing is copied out.
On its own, that bucket has no safe way to let an outsider in. A partner needs an IAM key you shouldn’t be handing out, the console keeps no log an auditor accepts, and the alternative is a gateway you build, secure, and then babysit forever.
Partners log in over the protocol they already use. Your team gets share links and a full record of every action. Your scripts keep talking to the same storage over the S3-compatible API. One platform sits in front of the cloud you already trust, and you never move a byte to get it.