ADD_ATTACHMENT issue---the request was rejected because no multipart boundary was found

ADD_ATTACHMENT issue---the request was rejected because no multipart boundary was found

hi all,

i am training to add an attachment to existing request from postman. i am getting below error.

{
    "operation": {
        "result": {
            "error_code": 4001,
            "message": "the request was rejected because no multipart boundary was found",
            "status": "Failed"
        },
        "name": "ADD_ATTACHMENT"
    }
}

up to now i haven't faced this issue with postman in the process of working with other tools. please help me to fix the issue. for your reference i attached postman request screenshot.

Thanks in advance.  

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