Or look for a different supplier. If you have invested huge amounts of time an money in stuff only for it to become useless, it makes you think seriously about the reliability of new stuff from the same supplier. My 570-page (A4) book was admittedly in chunks, but I don't want to have to try to work from the somewhat odd pdfs that Pageplus provided to get new thing developed. .The more I see, the less I like. I have frequently used autoflow on PPX as I have edited text to suit the page, or fitted more stuff in. In Affinity it seems that you write your text in an external program and create an autoflow box. Firstly, I cannot see how to create such a box. Autoflow is in the Help files, but they don't say where to find it. Secondly, I want to ensure that I can insert a picture and adjust the text (or vice-versa) to improve the look of the books. It is useless having text boxes that do not interlink and reformat if you add some text, and worse than useless if your images cannot be included where you want them and at the size you want.
I have just pasted some text into a text box - but it did not fit. It also does not want to autoflow like Pageplus. I did finally find the tiny little triangle that sets autoflow, but you have to draw each new text box on every page it seems. I realise this is a Beta, but I am truly not impressed positively. In addition, there is no obvious way to pin or anchor (say) an image to a specific bit of text.