Thank you for the interesting question. I do not see any images you posted, but I will attempt to help you find an answer. The article you listed mentions Multipart Uploads (MPU) and Versioning, which you mentioned in your question as well. You said you did not see Multipart Uploads. Do you have versioning enabled on the bucket? The final recommendation in the article is to setup Lifecycle Policies. I urge you to configure a Lifecycle Policy to delete MPUs after something like 3-7 days. If you have versioning enabled, you may want to delete old versions after 7-14 days as well.
To get a clearer picture of what is happening in your account/bucket, I recommend enabling S3 Storage Lens . There is a default setup in S3 Storage Lens that does not have a fee associated with it. It'll take a day or 2 for the metrics to populate and once it's there, you'll be able to use the dropdown metric options to see the current versions, noncurrent versions, and MPUs for bytes, object count and/or in %. These options should help you determine what is taking up your S3 storage.
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