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I updated Android a day or two ago. No issues, until I tried to read my latest Ao Oni book during lunch today. It turns out that the app I generally use won't work with the new version of Android. Which, okay, I can use a different app and try to figure out where I stopped reading. But 1) I really liked this app and 2) this means that I've lost my notes for one book I haven't reviewed yet. Hopefully they update the app soon, but users have apparently been complaining about this since late September with no response from the developer, so it doesn't sound good.
