While it is not possible to insert page breaks into an article, it is possible to affect where page breaks appear at a higher level. Using Custom CSS you can specify that page breaks should occur after every level 1 heading or that no page breaks should appear between articles when exporting a manual. You can also specify a maximum height for images. If the maximum height is smaller then it is more likely that the text and image can stay together.
Refer to our Custom CSS article for examples.