Hello, I have an app in the Google Play Store that was from another account and it was transferred to my account, because it will no longer play with it and the client asked us to work on the next version. The problem is this: when we upload the new APK it asks us to sign with the APK's previous keystore, but the other dev does not want to pass the keystore (it makes sense since it's his). I saw in the Google documentation how to put a new keystore to sign with our key the next versions, but I could not understand very well how this process of submitting the new key there in the control panel of the Play Store. If someone can explain otherwise or make available some material I will be grateful.