func batchUploadNew(){

        let fileData = "test data example".data(using: String.Encoding.utf8, allowLossyConversion: false)!
        var fileSize = UInt64 (fileData.count)

        // array of files to be uploaded
        var filePathArray = [String]()

        // array of
        var finishArgArray = Array<Files.UploadSessionFinishArg> ()

        // generate file names
        for i in 0...100 {
            filePathArray.append("/dbText/file_\(i).txt")
        }


        let dispatchGroup = DispatchGroup()


        if let client = DropboxClientsManager.authorizedClient {

            // start uploading
            for filepath in filePathArray {

                dispatchGroup.enter()

                client.files.uploadSessionStart(close: true, input: fileData).response { response, error in

                    if let result = response {

                        let cursorInfo:  Files.UploadSessionCursor =  Files.UploadSessionCursor (sessionId: result.sessionId, offset: fileSize)
                        let commitInfo: Files.CommitInfo = Files.CommitInfo(path: filepath, mode: Files.WriteMode.overwrite, autorename: false,  clientModified: nil,  mute: false)
                        let finishArg: Files.UploadSessionFinishArg =  Files.UploadSessionFinishArg(cursor: cursorInfo, commit: commitInfo)

                        finishArgArray.append(finishArg)

                    } else if let err = error {

                        print(err)
                    }


                    dispatchGroup.leave()
                }

            }

            // commit


            dispatchGroup.notify(queue: .main) {

                // all of them are done


                client.files.uploadSessionFinishBatch(entries: finishArgArray).response{ response, error in

                    if let result = response {
                        print(result.description)
                    }
                }

                // uploadSessionFinishBatchCheck

            }

        }
    }