if the story doesn't exist/is null, throw
ensure chapter word count is updated (since we weren't already doing that for some reason....)
instead of clearing the original story's chapters and re-adding them one by one, update the existing ones in place, otherwise push to the array
use new signature for `replaceOrUploadContent` call
ensure chapters are sorted
☙◦ The Tablet ❀ GamerGirlandCo ◦❧
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