The official Android apk does not come with a save, and cannot have saves dropped into it. This is something to with the RPGmaker engine/the way android stores saves.
The only way to keep save info is to install the new version over an old version on your phone. It sucks but there isn't anything the devs can do.
If you are playing an android version of the latest content it isn't official and you'll have to hope some tech head here can guide you.
On subscribestar there is a new version with the brenda screen bug fix. When a version goes, for example, from 6.5 to 6.5a do they upload the new version here as well? Or do new uploads happen only when a more major change happens, say 6.5 to 6.6?