The way the editor works this is not quite possible to do. The editor unlike conversion or polish works on the same file that is input to it. So for conversiona nd polish when both epub and original_epub are present, original_epub is used. This cannot be done in the editor.
Note that the editor has a save a copy action which you can use to easily update a temp file without touching the original. And you can then review the temp file in whatever third aprty software you like.
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