This section contains all multipart operations.
that apply to all Multipart Operations:
If a multipart upload is not aborted, space that is used by the parts that belong to this multipart upload will not be reclaimed. It is the user’s responsibility to make sure unnecessary or failed multipart uploads are cleaned up correctly.
The size of each part, except the last, of a multipart upload object should be at least 5 MB.
The part-number is not necessarily contiguous, that is, upload parts could be 3, 1, 5, but part numbers must be in ascending order when calling complete-multipart-upload.
See the table of limitations for copy-object and upload-part-copy in Operations on Objects.