Kivy on Android : How to keep local saved file after app update?

I want to know the correct steps to keep local saved data after app update.

I confirmed the following old question, but I can't solve the issue. Save app data in kivy on Android

I tried the following.

1. 1-1:I made android APK with buildozer(command:buildozer android debug). 1-2:And execute 'store.put' method using 'kivy.storage'. then 'hello.json' file was created in the './' directory. https://kivy.org/doc/stable/api-kivy.storage.html

   1-1:'./' directory in APK ver.1

   main.pyo

   1-2:'./' directory in APK ver.1

   main.pyo, hello.json(created)

2. 2-1:I made android APK ver.2(same app name as 1.APK). 2-2:After installing in update mode, execute only 'store.get' method using 'kivy.storage'. then method failed because 'hello.json' file was automatically deleted with app update.

   2-1:'./' directory in APK ver.2

   main.pyo(changed from APK ver.1)

   2-2:'./' directory in updated APK

   main.pyo(ver.2)

3. I tried changing the output location of the 'hello.json' file but it made no sense. e.g. './data/data/[app_name]/files/hello.json' and './data/data/[app_name]/shared_prefs/hello.json'

How can I update my application?

Everything in the default current directory, which is named app, is deleted and replaced on app update. You can place persistent data in the directory above this, i.e. ../, and it should stick around between updates.

You can also use your app's external storage directory, using pyjnius to query the Android API for its location, but I don't have code for that right now.

This isn't especially well documented, I'll try to improve it.