I have the old remarkable and use it without its cloud features. Even though, according to its documentation, it's supposed to be able to handle EPUBs, I have,

I have the old remarkable and use it without its cloud features. Even though, according to its documentation, it's supposed to be able to handle EPUBs, I have, for some reason, never gotten them to work. I have also kind of "standardized" on PDF for the way I manage my own collection, because you can always make EPUBs into PDFs, but not the other way around.