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I tried uploading several books from Project Gutenberg and I'm getting errors on a few stating in red that "This file cannot be processed".
I click on the learn more link but it doesn't really connect me to anything debug worthy.
Anybody know how to get information about what exactly went awry?
Initial things to try: Have you used an epub validator to confirm that it is a valid epub? Is the file encrypted in some way? (Can you view it in a browser or readium or Adobe Digital Editions)? Was the upload interrupted? I would remove and try again. In my experience though, GPB has been pretty reliable for valid epubs.
So I solved this issue by converting epub file to mobi format (mobi is the format kindle uses) and then converting back to epub. After doing this, google books didn't have issues processing it. There are multiple online converters you can use.
