I have an Android project built with Android Builder that already includes the full AppLovin SDK; keys, unit-IDs and manifest entries are all in place and compile without errors. Banners and other calls behave as expected, yet the interstitial ad never shows—there is no crash, no callback, simply no impression. Your task is to pinpoint why the interstitial placement stays blank and deliver a working solution I can drop straight back into the current build. Feel free to trace the request flow, adjust adapter or pro-guard settings, update Gradle dependencies, or patch any missing life-cycle hooks; as long as the ad reliably appears on command and reloads cleanly, the goal is met. Please return: • corrected project files or clearly-marked code snippets • concise notes on what was wrong and how you fixed it so I can reproduce the steps on future versions If another format or version upgrade is ultimately required, let me know in advance so we can keep release size and review time to a minimum.