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If you wish to replace the image file used as the cover:
1. Click on "Edit Metadata" on the main menu bar. In the Change Cover box, click on browse and navigate to the new file's location and import to the file in calibre. This will show on sidebar.
2. Click "Embed Metadata". This replaces the cover image in the images directory within the epub or azw3.
3. Open the file editor. Navigate to the text folder. Delete the "titlepage.xhtml"
4. Within the editor, click 'tools' (on the menubar), 'add cover' and select the new cover image. This creates a new titlepage.xhtml
5. You may want to edit the titlepage.xhtml to change how it is displayed. I like to change "preserveAspectRatio="none"" to "preserveAspectRatio="xMidYMid meet"". This preserves the aspect ratio of height to width.
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