How do I reduce file size on my keynote ios/ipad?

I created a keynote presentation that is image heavy and 75 pages. The file size is huge and is taking hours to e-mail. I need help figuring out how to reduce the file size (I want to save/e-mail it as a PDF). Any ideas? When I searched, I came up with a way to reduce file size on the regular keynote, but don't see anything for the ipad.