Yes, but from what I understand that is for appian to connect to them. My question is if appian itself has its own box with some file transfer protocol.
Appian itself does not provide built-in S3 storage capabilities or a native "box" for file storage. However, it offers robust integrations with external storage solutions like AWS S3 through plugins available on the Appian AppMarket. You can utilize the AWS S3 plugin to connect Appian with AWS S3, allowing you to store and retrieve documents. This setup requires configuring specific AWS users, roles, and bucket policies to establish a secure and private connection.