I don't know about the program that you were using to build apk..
You need to export for Cordova, and then build the apk using one of these methods:
1. Construct 3 build service (you need to buys a subscription)
2. Phonegap (probably not working anymore)
3. Cordova CLI
4. Enhance (you can use it to add ads)
5. or maybe some other service