Google Play App Signing
Starting August 2021, new apps are required to publish with the Android App Bundle on the Google Play Store.
Option 1 - You own the key that signed your app
You will have to manually build and signed your APK then upload it to the Rootpk Store.
Option 2 - Google owns the key that signed your app
You will have to manually download a signed universal APK from Google then upload it to the Rootpk Store.
- Open the App bundle explorer page (Release > App bundle explorer).
- Select the version filter near the top right of the page.
- On the "Choose a version" table, select the right arrow on the version that you want to view.
- Select the Downloads tab.
- In the "Assets" table, select the download icon next to the "Signed, universal APK" file.
You can automate it using the Google Play Store Developer API (more info).