I'm having a similar problem. I centered my image on my cover, but when I see the thumbnail of it on the Blurb website, it seems off center. Do I need to allow for certain margin or spine area for the cover, that's not indicated on the blurb template in InDesign?
how do I fix a cover page problem
in editing the page is centred perfectly
once uploaded it goes off centre
it is loaded in pdf
each time I have re edited the cover page and still once loaded the view you see is off centre
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Hi there! If you use InDesign to create your book, the centre of the page lies between the book gutter and the black trim line. https://support.blurb.com/hc/en-us/articles/207792876
If you use Bookwright to create your book, you can move your image on the page until a vertical blue line appears, which indicates the centre of the page. https://support.blurb.com/hc/en-us/articles/207792656