Usually this is caused by memory pressure on the device. I was able to load it on my 6 plus, but I'll try next week on my iPad.
My recommendation is to reduce the size of your images. You have a few like 'iPad-09.jpg' which is 1536 × 4019 pixels even though most of the image is just a white background. I would try reducing the size of those images to just the text area and then positioning the image in Hype and using a white a background. If you do this with all your large mostly white images does it still crash?