Large files go to S3 with blank: the file is sent in parts that upload in blank, and a failed part is retried on its own.

Answer

Large files go to S3 with multipart upload: the file is sent in parts that upload in parallel, and a failed part is retried on its own.

Also accepted: multipart, multi-part upload for multipart upload.

Why

Without it, a network blip at 90% of a 5 GB upload means starting over. Parts can also be uploaded with pre-signed URLs, one per part.

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