IMPORTANT Once again, if you play the download Android APK version of the game and currently have installed a version prior to 0.7.12, you MUST install and launch version 0.7.15 BEFORE installing the new APK, or you will LOSE ALL YOUR LOCAL & AUTO SAVES (not your to-file saves).You’ll know the mechanism is working when you update to 0.7.15 because it gives you an annoying popup whenever anything saves. Once you have seen the popup, it is safe to download and install versions 0.7.16+. Version 0.7.15 is pinned on the PLAY page.
You most likely lost your saves because of this. Normally you shouldn't need to use the save to file except to create the occasional backups.