What is the error you are getting when connecting to the cloud server?

You can press CTRL + ~ to view the logs during connection.

$ sftp -i keyssh -P 22 root@162.44.47.129

but with the configuration in the sublime text, I can’t..

{
    // The tab key will cycle through the settings when first created
    // Visit https://codexns.io/products/sftp_for_subime/settings for help
    
    // sftp, ftp or ftps
    "type": "sftp",

    "sync_down_on_open": true,
    "sync_same_age": true,
    
    "host": "162.44.47.129",
    "user": "root",
    //"password": " ",
    "port": "22",
    
    "remote_path": "/root",
    //"file_permissions": "664",
    //"dir_permissions": "775",
    
    //"extra_list_connections": 0,

    "connect_timeout": 20,
    //"keepalive": 120,
    //"ftp_passive_mode": true,
    //"ftp_obey_passive_host": false,
    "ssh_key_file": "/home/sodex/llaves/jenrrysh",
    //"sftp_flags": ["-F", "/path/to/ssh_config"],
    
    //"preserve_modification_times": false,
    //"remote_time_offset_in_hours": 0,
    //"remote_encoding": "utf-8",
    //"remote_locale": "C",
    //"allow_config_upload": false,
}