Step 1: Download your app’s .apk by clicking in the circled area
Step 2: Log in to the Developer Console and select the app you want to update
Step 3: Click Release Management
Step 4: Click App Releases
Step 5: Click Create Release
Step 6: Scroll to the section titled “Android App Bundles and APKs to add” and add your .apk either by drag and drop or the file manager
Step 7: Scroll to the bottom of the page and click save
Step 8: Stay here, click Review
Step 9: On the next page, scroll tot he bottom and click Start Rollout to Production