What is the StoreName and how can I send attachment from local folder?

Sample Request:

{
    "fromAddress": "my@mydomain.com",
    "toAddress": "family@mydomain.com",
    "ccAddress": "colleagues@mywork.com",
    "bccAddress": "restadmin1@restapi.com",
    "subject": "abc",
    "content": "Email can never be dead. The most neutral and effective way, that can be used for one to many and two way communication.",

    "attachments": [{
        "storeName": "NN2:-167775813820412438",
        "attachmentPath": "/1425407266885_ourholidays",
        "attachmentName": "ourholidays.jpg"
    }],

}