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IMHO do not convert (just for this) as it may introduce other changes
Use one of the other tools:
Embed metadata, Polish (be sure to review the settings as this can do other cleanup) or Modify EPUB (a plugin)
Each has its strong points.
BTW Using Calibre to send to ... updates the sent copy on the fly without touching the Library copy
The cover.jpeg you see (and you do not really need to even be there, beneath the skirts. Calibre Delivers without you knowing where it has been filed) is what is shown in the details pane.
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