SwiftDropbox too many write operations when writing 4 files

Thanks I didn't think to look at the test cases! For future reference for other users looking for the same, here's the version of my Swift code adapted from the test that works:

var filesCommitInfo = [URL : Files.CommitInfo]()

for filePath in filePaths {
    let fileUrl: URL! = URL(string: "file://\(filePath)")
    let uploadToPath = "/\(fileUrl.lastPathComponent)"
    filesCommitInfo[fileUrl] = Files.CommitInfo(path: uploadToPath, mode: Files.WriteMode.overwrite)
}

self.dropboxClient!.files.batchUploadFiles(
    fileUrlsToCommitInfo: filesCommitInfo,
    responseBlock: { (uploadResults: [URL: Files.UploadSessionFinishBatchResultEntry]?,
                      finishBatchRequestError: CallError<Async.PollError>?, 
                      fileUrlsToRequestErrors: [URL: CallError<Async.PollError>]) -> Void in

        if let uploadResults = uploadResults {
            for (clientSideFileUrl, result) in uploadResults {
                switch(result) {
                    case .success(let metadata):
                        let dropboxFilePath = metadata.pathDisplay!
                        print("Upload \(clientSideFileUrl.absoluteString) to \(dropboxFilePath) succeeded")
                    case .failure(let error):
                        print("Upload \(clientSideFileUrl.absoluteString) failed: \(error)")
                }
            }
        }
        else if let finishBatchRequestError = finishBatchRequestError {
            print("Error uploading file: possible error on Dropbox server: \(finishBatchRequestError)")
        } else if fileUrlsToRequestErrors.count > 0 {
            print("Error uploading file: \(fileUrlsToRequestErrors)")
        }   
})

PS Greg I've been browsing the forums lately and you seem to be everywhere, answering people's questions with unlimited patience and kindness. Just wanted to say you're a superstar, thanks