when the form form data comes from the foreground, the multipartFiles in request has data (an array), but using MultipartFile file to fetch it gives null, advice on how to get the contents out of it.
this is the value in debug

the following is the foreground js input form form

var formData = new FormData();
        formData.append("networkServiceType", networkServiceType);
        formData.append("networkServiceName", networkServiceName);
        formData.append("networkServiceAdd", networkServiceAdd);
        formData.append("networkServiceTel",networkServiceTel);
        formData.append("networkServiceLongitude",networkServiceLongitude);
        formData.append("networkServiceLatitude",networkServiceLatitude);
        for(var i = 0; i < fileList.length; iPP){
            formData.append("file[]", fileList[i]);
        }
        
        console.log(formData);
        $.ajax({
            type: "POST",
            url: projectname + url,
            data: formData,
            contentType: false,
            processData: false,
            mimeType: "multipart/form-data",
            success: function (data) {
                if(data.code ===0){
                    alert("", function(index){
                        vm.reload();
                    });
                }else{
                    alert(data.msg);
                }
            }
        });