Cheyenne is certainly correct about the registration part.
If you've done your registration correctly, then try using the Storage app (or ES File Explorer) to copy (not move) the file into "Internal Storage"/"Downloads" (or /sdcard/Downloads if you're using ES file explorer). I suggest this because the exact error message you're seeing may be due either to file permission issues or the space in "Digital Editions". Also, remove any non-alphanumeric characters from the file name, other than ".", "-" and "_". Try adding the copied/renamed file.
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