This is my first day using my InkPad 3. I never used an e-ink device before, I might be making a simple mistake.
It's a game manual. You can download it for free.
https://www.gog.com/game/nox_archaist
In the archive you should find a PDF file and an .epub file. The PDF seems to be displayed correctly, but when you open the .epub it shows up very small in the top left corner of the screen, not much larger than a thumbnail.
I'm using Debian Linux. I copied the files manually, by connecting via micro-usb, using 'mount' command, sudo cp to the English folder. Then I left the directory, unmounted and unplugged it.
I suspect it's the game developer's fault. Other .epub files (that came with the device) display correctly. I haven't bought or otherwise copied any other files yet. Naturally, I looked into reading application settings, zoom level is at 100, switched between fit screen options, but it makes no difference.