AWS S3 Presigned Post url multipart uploads

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Is this possible? I have looked (and looked again). Multipart uploads are clearly possible using regular presigned URLs (ie. PUT), but I can't find any documentation to suggest that you can use them with POST. I found some examples, but they seem incorrect if only because they do not show the uploadID anywhere and, from what I understand, the multipart upload on S3 (logically) requires an uploadID to be able to reassemble the parts after you end the process.

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