Some Google Playstore PDF books are flowing and some are not. It's an evil format for ebooks that has encouraged many pirate scan uploads. PDFs are not really ebooks at all.
Only some technical stuff should be PDFs. Novels should be epub on Playstore, and it is the other upload choice for Publishers.
You can't have epub and PDF at the same time. Both are containers, one is for primarily reflowing ebooks and the other for proofing print jobs. Fixed layout epub is pointless, should be PDF. Flowing PDFs are an oxymoron, they should be epubs.
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