Ok I installed the Modify ePub plugin and I think it does not doing the changes on the metadata first page. I suppose than that in my case it will be to use for the cover issue.
So the unique solution for me seems to be to do an epub to epub conversion. But is that mean that if for example I had created the first page metadata converting the file and after I add a new category to that book, if I want that this new category shown on the metadata first page I must make again a conversion, is that right? I mean Calibre either your plugin doesn't synchronies these changes on that fisrt page.
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