Due to the never-ending, ongoing feud between Amazon and Apple, just sideloading your MOBI File to your iPad or iPhone will not give you a reliable preview of how your Kindle book will appear, to a purchaser, when bought from Amazon.

If you sideload your MOBI file, what you see will be significantly less-advanced, and less nice-looking, than how the book will really look.  If you ask us, we'll send you what's called an "AZK" file, which is a special file type used only to preview on iOS devices, along with the instructions, which are also shown in our article about this.  

Please see our detailed instructions and screenshots in our article about this, here.