Well, if you format the card as internal, you will wipe the card - which will basically defeat your purpose in having the card in the first place!
I tried opening a book in this way. I moved one of my ePubs to my sd card. I then used File Manager to find the book on the sd card. Long pressing the book icon didn't get me the usual reading options. But when I just tapped the book icon, then I got a list of reading app options to open the book. I picked the stock reader app, and the book opened fine.
The stock reader app is very inconsistent, I now find. I read one book with it, and it did fine. I then went to another book - also an ePub - and formatting was strange. Besides, the reader app decided to show only the first half of a certain word or two, and did that consistently whenever that word appeared! I've given up on the stock reader for now.
I recommend that you stick with Librera (which is excellent), or try Moon Reader Pro (equally good). I've tried KOReader, but I like either of the previous two better. Some folks also like AlReader because it is also E-Ink friendly.
The Likebook Mars has been consistent with my experience of previous Boyue products: the hardware is very good, but their stock apps tend to be buggy. Use third party apps for reading and such and you'll be much happier!
Last edited by downeaster59; 10-27-2018 at 09:12 AM.
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