Create account API | Delimited source | multi valued attribute

My observation with respect to delimited input file.

  1. Multi values always surrounded with double quote as shown below example data and then separated with Delimiter which is specified int the Additional Settings page

  2. headers of the file optional to surrounded with double quote.

  3. single value attribute also optional to be surrounded with double quote.

userID,empID,email
"reddy","123","[email protected],[email protected],[email protected]"
dummy,124,"[email protected],[email protected],[email protected]"
test,125,"[email protected],[email protected],[email protected]"
"attributes": {
            "empID": "124",
            "userID": "dummy",
            "email": [
                "[email protected],[email protected],[email protected]"
            ],
            "idNowDescription": "qwerty"
        },
"attributes": {
            "empID": "125",
            "userID": "test",
            "email": [
                "[email protected],[email protected],[email protected]"
            ],
            "idNowDescription": "abc"
        },

hopefully this will give clue to your JSON input data in API call.