Perhaps you format your own books, and yet, you find that when you go to upload to promotional services such as BookSprout or StoryOrigin, the file sizes exceed limits. They mention to use Calibre to reduce file size (and I have a class on how to reduce your file sizes), but maybe you just want to turn it over to someone. In addition to our book formatting service, we also offer file size reduction.
When you allow us to format your book we reduce the file size automatically. So there’s no need to add this service. However, if you have someone else format your files (Though any competent book formatter should take steps to reduce file size.), you may still have issues with file size. You may want to have the file size reduced, and I can take care of that for you with a 24 hour or less turn around time.