var path = "/dir1/sub-dir1/selfie.png";
using (var stream = System.IO.File.Open(path, FileMode.OpenRead));
var options = new FaluClientOptions { ApiKey = "fskt_123456879", };
var client = new FaluClient(Options.Create(options));
var request = new FileCreateRequest
{
Content = stream,
Purpose = "customer.selfie",
};
await client.Files.CreateAsync(request);