This is an SFTP server running atop SSH. It can be configured using an input json file, whose fields are documented in src/config.rs.
Though the server can be configured manually and run singularly, its desired usage is to be set up as a docker container and then bundled with docker compose. To this end, there are the docker.json, Dockerfile, and server.yaml files that are intended to handle all configuration.
If following all the setup instructions, the server should be 'plug-n-play', and you shouldn't deal with any other configurations.