以下案例演示“多选附件（文件服务）”的webapi赋值，分为以下三个步骤：

1. 上传附件，获取到fileid；

2. 通过webapi获取附件信息；

3. 调用单据保存操作，携带“多选附件（文件服务）”数据；

   
   

一、调用文件上传接口得到fileid，本例演示上传2个附件

二、获取文件信息，调用webapi单据查询接口，参考以下截图

三、调用单据保存，以下示例更新保存采购订单，然后指定多选附件的JSON

对应的JSON

{
    "formid": "PUR_PurchaseOrder",
    "data": {
        "NeedUpDateFields": [
            "F_PAEZ_Attachment","F_PIGM_Attachments"
        ],
        "Model": {
            "FID": 140253,
            "FPOOrderEntry": [
                {
                    "fentryid": 104280,
                    "F_PAEZ_Attachment":"2013dbee15a845098c0710a7729d3cad",
                    "F_PIGM_Attachments": [
                        {
                            "ServerFileName": "2013dbee15a845098c0710a7729d3cad",
                            "FileName": "测试名称1.txt",
                            "FileLength": 1,
                            "FileBytesLength": 7
                        },
                        {
                            "ServerFileName": "096ecfaf8f444224857f1901e5d70320",
                            "FileName": "测试名称2.txt",
                            "FileLength": 2,
                            "FileBytesLength": 2048
                        }
                    ]
                }
            ]
        }
    }
}