Make a book shape with blender. When you're done, select the side and seam mark it.
Select the parts separated by the seam and expand and arrange them by uv so that they do not overlap.
Return to CSP and place the illustration. Pay attention to the top and bottom.
When pasting an image, click Open to paste.
it is complete. It will be more realistic if there is also a barcode on the back cover.
You can also create a double-page spread and paste it. For some reason, I can't start blender, so that's it 😢