emqx4.3/rel/config/ee-examples/file_transfer-with-local-exporter.conf.example

## File Transfer over MQTT exporting files to local file system
##
## NOTE: This configuration is only applicable in EMQX Enterprise edition 5.1 or later.

file_transfer {
    ## Enable the File Transfer feature
    enable = true

    ## Storage backend settings
    storage {
        ## Local file system backend setting
        ## Currently, it's the only available storage backend.
        local {

            ## Segments and temporary files storage settings
            segments {
                ## Directory where these files are stored
                root = "/var/lib/emqx/transfers/segments"

                ## Garbage collection settings
                gc {
                    ## How often to run GC
                    interval = 1h

                    ## Maximum time to keep parts of incomplete transfers for
                    maximum_segments_ttl = 24h
                }
            }

            ## Local filesystem exporter
            ## Enable the backend
            ## Note: Can only configure one backend at a time
            ## One can set 'exporter.local.enable=false' to disable it
            ## while keeping the configuration context
            exporter.local {
                ## Directory in the local file system where to store transferred files
                root = "/var/lib/emqx/transfers/exports"
            }
        }
    }
}