public static async Task <SanityDocumentResponse <SanityFileAsset> > UploadFileAsync(this SanityClient client, Uri fileUrl, string label = null, CancellationToken cancellationToken = default) { if (fileUrl == null) { throw new ArgumentNullException(nameof(fileUrl)); } var mimeType = "application/octet-stream"; var fileName = fileUrl.PathAndQuery.Split('?')[0].Split('#')[0].Split('/').Last(); var extension = fileName.Split('.').Last(); if (extension != fileName) { mimeType = MimeTypeMap.GetMimeType(extension); } using (var fs = await _httpClient.GetStreamAsync(fileUrl).ConfigureAwait(false)) { var result = await client.UploadFileAsync(fs, fileName, mimeType, label ?? "Source:" + fileUrl.OriginalString, cancellationToken).ConfigureAwait(false); fs.Close(); return(result); } }