mulitple files upload doesnt work

Hi,

I am currently using Files.UploadAsync to upload files to a folder. However, it is very slow to process if there are a bunch of files.

I looked through the documentation and there isn't any method to upload a group or files with just a single call?

Below is my code to upload single file

var file = "41b08b49683d4e91be1a5a13c16d502c.jpg";
var folder = "/" + pid  + "/";
var lastpath = folder + file;
var mem = new MemoryStream(File.ReadAllBytes(pathname + filename));
var upload = await dbx.Files.UploadAsync(lastpath, Dropbox.Api.Files.WriteMode.Overwrite.Instance, false, null, false, null, mem);