public async Task <UploadStartResponse> UploadDropBoxAsync([FromBody] DropBoxRequest model,
[FromServices] IRestClient client,
[FromServices] IDocumentDirectoryBlobProvider documentDirectoryBlobProvider,
CancellationToken token)
{
var(stream, _) = await client.DownloadStreamAsync(model.Link, token);
var blobName = BlobFileName(Guid.NewGuid(), model.Name);
await documentDirectoryBlobProvider.UploadStreamAsync(blobName, stream, token : token);
return(new UploadStartResponse(blobName));
}