AWS S3 launched a new feature called S3 Files: Amazon S3 Files
It allows using S3 as a file system in EC2 and other AWS servers. I understand syncthing does not support traditional S3, but can it be used to sync from a normal file system with S3 Files?
I don’t know S3 Files specifically, but Syncthing accepts most things that look and feel like files. Mounting s3 with s3fs or rclone mount usually works so I suspect this is similar.