I'm assuming that epub is the native format and so when Amazon's tool does its censorship routine, it scans your device for a file matching its own internal format and replaces it. If that's how it works, then going for a converted format would be best since it would be less likely they'd replace it
EPUB works better and you can own the file like a PDF.
I'm assuming that epub is the native format and so when Amazon's tool does its censorship routine, it scans your device for a file matching its own internal format and replaces it. If that's how it works, then going for a converted format would be best since it would be less likely they'd replace it