微信小程序如何发送语音文件是这个sendSingleFile函数吗

微信小程序如何发送语音文件是这个sendSingleFile函数吗，文件的 DataForm 对象不支持所以直接使用的recordPath是一个临时的mp3文件
this.$JIM.sendSingleFile({
'target_username' : that.userInfo.username,
'target_nickname' : that.userInfo.nickname,
'file' : recordPath,//recordPath 是一个临时的mp3文件
'appkey' : uni.getStorageSync('appkey'),
}).onSuccess(function(data , msg) {
console.log('录音结果' +JSON.stringify(data))
console.log('录音结果2' + JSON.stringify(msg))
}).onFail(function(data) {
//同发送单聊文本
console.log(JSON.stringify(data))
});
总是报错
VM33:2 thirdScriptError
Cannot read property 'toString' of undefined; [Component] Event Listener Error @ components/pg-chat/chat-record#(anonymous)
TypeError: Cannot read property 'toString' of undefined
at o.setTarget (weapp:///common/vendor.js:12158:98115)
at h.__sendVideoOrFile (weapp:///common/vendor.js:12158:66429)
at h.sendSingleFile (weapp:///common/vendor.js:12158:36175)
at VueComponent.onRecordFinish (weapp:///pages/index/singlechat.js:787:23)
at eval (weapp:///common/vendor.js:1138:28)
at Array.forEach ()
at eval (weapp:///common/vendor.js:1105:19)
at Array.forEach ()
at Se.handleEvent [as __e] (weapp:///common/vendor.js:1095:13)
at Se.T.d...d.addListener.capture (eval at n.call.document (http://127.0.0.1:59440/remote-debug/runtime.js?devtools_ignore=true:1:1), :2:1708652)