- 当前 Bug 的表现（可附上截图）     返回结果：     {"errorCode":1,"errorMessage":"user code exception caught","stackTrace":"Error: errCode: -501001 resource system error | errMsg: uploadFile:fail MultipartParser.end(): stream ended unexpectedly: state = PART_DATA; at uploadFile api; \n    at new CloudSDKError (/var/user/node_modules/wx-server-sdk/index.js:2679:28)\n    at returnAsCloudSDKError (/var/user/node_modules/wx-server-sdk/index.js:2731:16)\n    at Object.returnAsFinalCloudSDKError (/var/user/node_modules/wx-server-sdk/index.js:2745:13)\n    at Object.\u003canonymous\u003e (/var/user/node_modules/wx-server-sdk/index.js:2213:58)\n    at step (/var/user/node_modules/tslib/tslib.js:133:27)\n    at Object.throw (/var/user/node_modules/tslib/tslib.js:114:57)\n    at rejected (/var/user/node_modules/tslib/tslib.js:105:69)\n    at \u003canonymous\u003e\n    at process._tickCallback (internal/process/next_tick.js:188:7)"} - 预期表现     传入了要求的参数【可读流】，调用应该成功 - 复现路径 - 提供一个最简复现 Demo     提供三种云函数调用case，均无法实现写数据到存储，本地测试创建的可读流没有问题 const cloud = require('wx-server-sdk') const fs = require('fs') const streamifier = require('streamifier') var streamBuffers = require('stream-buffers'); cloud.init() exports.main = async (event, context) => { /* --------------------------case0---------------------------------  var readerStream = new stream.PassThrough();  readerStream.end(new Buffer('Test data.'));  ----------------------------------------------------------------------*/ /* --------------------------case1---------------------------------  let readerStream = streamifier.createReadStream(new Buffer('Test data.'))  ----------------------------------------------------------------------*/ /* --------------------------case2---------------------------------  var readerStream = new streamBuffers.ReadableStreamBuffer({    frequency: 10,      // in milliseconds.    chunkSize: 2048     // in bytes.  });  readerStream.put('Test data.');  readerStream.stop();  ----------------------------------------------------------------------*/ return await cloud.uploadFile({         cloudPath: 'demo.txt',         fileContent: readerStream     }) }