Uploads a Uint8Array stream of unknown size to an Amazon S3 endpoint.

The stream is buffered into chunks of fixed size (partSize, 5MB by default). The chunks are uploaded as a new S3 Multi-part Upload and then finalized. Multiple chunks can upload at the same time (queueSize, 4 by default). This can result in faster uploads for larger files, compared to a single request.

Objects smaller than 5MB skip the multi-part logic entirely and use putObject instead.

Note that multi-part uploads require different IAM permissions than simple uploads. Consider testing your application with files both above and below 5MB.