"type": "sftp",
"sync_down_on_open": true,
"sync_same_age": true,
"host": "xxx.amazonaws.com",
"user": "xxx",
"remote_path": "/var/www",
"connect_timeout": 30,
"ftp_passive_mode": true,
"ssh_key_file": "D:\xxx.ppk",
"remote_time_offset_in_hours": 1,

{
    "type": "sftp",
    "sync_down_on_open": true,
    "host": "<your ec2 instance hostname>",
    "user": "<your username>",
    "remote_path": "<your remote path>",
    "connect_timeout": 30,
    "sftp_flags": ["-o IdentityFile=~<path to .pem file>"]
}

"sftp_flags": ["-i", "/Users/username/pemfile.pem"],