I managed to create an apk (kivy/python) using Coollaboratory and it works, but the Android device cannot install subsequent versions created in another session to the previous one, even if nothing changes in the code. APK versions are compatible only if created within the same session. How can I organize the apk update on the device?

I want compatible apk versions from kivy/python created in different Collaboratory sessions, but they are only compatible within the same session. I'm totally noob not only in android, but in whole programming, so sorry for silly question.