This connection is separate from your signing keystore – it’s what lets AppNatively actually submit your finished build to your Google Play account, rather than you doing it by hand.
Steps
1. Go to Connect Google Play / App Store
Open Settings → Connect Google Play / App Store.
2. Upload your Service Account key
Upload your Google Play Service Account key, a JSON file. A link to Google’s own instructions for generating one is right on this card if you don’t already have one.
3. Save, then verify
Save your changes, then click Verify Connection and confirm the badge shows “Connected.”