If you have not used our Online Editor to do your pagination (which we advise), we ask that the file names are numbered appropriately, ideally with 3 numbers (example of file names: 001.JPG/002.JPG/003.JPG...). This way you can ensure that the binding order of the pages is respected. The introduction of letters, if not added correctly can cause the system to misrepresent the binding order (automatic reading process and alphanumeric) and can not bind to DreambooksPro the non-use of this rule.