I just tried to publish an self developed/coded app (not any imported .aia) on play store. After app signing by google play i tried to upload my APK in the said folder. After completion of uploading an error pops up saying:
You uploaded an APK or Android App Bundle that is signed with a key that is also used to sign APKs that are delivered to users. Because you are enrolled in app signing by Google Play, you should sign your APK or Android App Bundle with a new key before you upload it