At least on my kindle manga (Japan-only PW3 with 32 GB of storage that I imported via ebay) with about 7 GB of stuff on it, text files won't open, it freezes for a bit, then portions of the home screen disappear, then it pops up an error message telling me it can't be opened and to delete it from my device and redownload if it's in kindle cloud. Using calibre to convert to mobi and email to kindle cloud works though.
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