It sounds like you want S3 itself to download the file from a remote server where you only pass the URL of the resource to S3.
This is not currently supported by S3.
It needs an API client to actually transfer the content of the object to S3.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…