[enricozb]

I have never been able to get EPUBs to reliably work on remarkable. My solution is to convert them to PDFs.

[jdkaiwei]

You can also install KOReader on remarkable as a reader. Works better IMHO. https://github.com/koreader/koreader

[polskibus]

If you do it, do you lose the ability to annotate?

[kimi]

I use them all the time. Never had any issue.

[sellweek]

I also use reMarkable as a (pretty good) EPUB reader, but it is really slow when opening the book for the first time or changing the rendering settings (font size, margins, etc.).

It can sometimes take a minute or two and sometimes it just hangs completely and you have to close the book and re-open it. I assume it's because it has to somehow render the whole book, to support the handwritten annotations and put them in correct places.