I'm saying that unless you do not use the Save to disk/Send to device function, your cover is going to (most of the time) get overwritten in your ePubs anyway when it ends up on your device/folder. So using this plugin to try to just update the metadata but not the cover is "futile" if your intent is to 100% guarantee that when the ePub is exported from calibre it still has your original large cover that is embedded. The only way I know of to ensure the cover remains at its large size, is to extract the cover from the ePub and make it your calibre cover. In which case using the update metadata command of the plugin is going to not negatively impact your cover at all since it will replace it with the same one.
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