Did you read this passage
In particular, it says
For security reasons you will never be able to upload a file with identical name again. This strict requirement does have one exception: documentation files may be overwritten.
In other words, you have to
bump up the version number if you make a mistake in uploading.
Update: You don't have to, I guess, but what's in a version number anyway? As long as you don't go backwards (n.b., Adobe Illustrator) I couldn't care less.
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