I want to put this here as I remember seeing it somewhere but I forgotten where it is or how to do it properly and just to make sure I don't messes up my save file while updating on my Android.
On android, your only way to update is to download the newer .apk and use it. It should automatically give you the option to "update" instead of "install" when you open the .apk. The saves aren't changed when you update this way. The "update files only" .zip is for other systems, and doesn't work on android.
