Uploading a cover now requires the file to be in PDF format. Why? It is easier for a beginner / enthusiast to create an image (and measuring in pixels for the spine) than to create a document with certain measurements. By requiring a PDF you also require more command of a desktop publishing application, and adding a manual step for the user. The risk is that some measurement is wrong and the cover ends up incorrect. Please bring back the option to upload a image file (with different measurements to identify where the spine starts / ends).