PrintReady
One upload–review–fix cycle at a time is the slow way to learn your interior has a 33-DPI image. PrintReady pre-checks the PDF the way the review does, repairs the structural defects, then re-checks the repaired file.
Get PrintReady — $29 one-timeSeeded 5-page 6×9 interior (margin violator, 33-DPI image, rotated page, CropBox mismatch, blank page): 2 structural repairs applied; re-check confirmed all 3 blocking errors per page with 0 invented fixes.