You can also email epubs this way. You just have to rename them as .PNG because Amazon doesn't allow epubs. But if you trick it as PNG it forgets about this and

You can also email epubs this way. You just have to rename them as .PNG because Amazon doesn't allow epubs. But if you trick it as PNG it forgets about this and converts it just fine. Of course you can also convert with calibre but this method works well too. Edit: oh apparently they support epub officially now. They didn't for a long time and the above workaround was great for years