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  • thanks this is what i was looking for. But regarding the S3 part, i wonder why they need upload id, the "key" itself can be used to uniquely identify object. Commented Feb 16, 2021 at 16:20
  • @stkUser Does it? I don't think they actually replace the object until the upload finishes, which means you can have old and new objects. Maybe you can upload the same object more than once at the same time, too. You wouldn't want to mix them up. Commented Feb 16, 2021 at 16:27
  • yeah may be internal working of s3:) Commented Feb 16, 2021 at 20:49