I have listed a handful of kindle ebooks on Amazon. Since the ebooks were already completed and being sold in PDF form from my website, I used a sub-contractor to convert them all.
Amazon has a 50MB file limit/ebook prior to being uploaded. All of my ebooks contain many photographs and are therefore each between 30-42MB in size. From my WEBSITE, my best seller from the series of 5 was a consolidation which essentially is a collection of all 5 individual ebooks. The price for the "collection" was about the cost of 3.5 individual ebooks, if bought separately.
How can I duplicate the collection for Amazon when the file size would be greater than Amazon's 50MB maximum? Is there any way to "compress" mobi format ebooks and combine several of them? Or, any other approach, other than reducing the size or resolution of the images before conversion, because they are already slightly smaller than I wanted?