At first, I successfully built a release version and upload it to google play. But it was refused because API is below 28. So I downloaded the newest daily version. Apk built this time immediately crashed when trying to open (some solved this problem by adding the admob id, but my build.setting already has the id there, I don't know how to fix this problem).
I decided to uninstalled corona sdk since it wouldn't let me go back to the previous version. I cleared all the cache, restart the window, download and install the public release of corona again to build apk. But I don't know why no matter what I do, it won't build release version anymore. With my keystore, it keeps building debug version. I hope anyone can help me to solve this problem. Thank you in advance.