You need to put the files in the "App Data Folders" to be able to download them, you can then trigger a download by doing a http request to this url (See how it's done in the "Manage App Data" view in the core's web interface): Node that you'll need to do an auth request first with the username and password of the core (or even better, a new user that only can download theese files). For SMB: https://flows.nodered.org/node/node-red-contrib-smb and FTP: https://flows.nodered.org/node/node-red-contrib-ftp
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