Resume transfer after reboot or app crash with S3

Theres no way to resume same big upload of file after reboot or app crash.
Like CuteFTP would be nice for S3 or cloud uploads.

Thanks for your post.

I have added a request for resume support with S3 protocol the tracker:
https://winscp.net/tracker/1899
You can vote for it there.

What do you mean by "cloud uploads"?