FTP file uploader

Performs a simple upload of an array of files to an FTP.

Input example:

{ 
    "host": "ftp.pexample.com",
    "port": 21,                             // optional, default: 21 
    "folder": "my-folder/data",             // optional, default: "/"
    "username": "test-user",
    "password": "strong-password",
    "fileUrls": [
        "https://example.com/file-1.pdf",
        "https://example.com/file-2.pdf",
    ]
}