For iOS, I convert them into PDF and read it on [Adobe Acrobat Reader](https://apps.apple.com/in/app/adobe-acrobat-reader-pdf-maker/id469337564), make sure to enable vertical scrolling.
I don’t think there’s any other way.
I recently asked the developer of [iComics](https://apps.apple.com/in/app/icomics/id493845493) if he could implement vertical scrolling but he said the feature is reserved for iComics 2 which is currently under development.
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