SAB not creating apk files using EPUB book

I am trying to import an EPUB file containing music into SAB in order to convert it into an Android app. But when I try to build an Android app with it a message says it has been completed but no .apk file is produced. Many thanks for any help.

What folder are you looking it for the .apk file?

It should be in the folder: Documents\App Builder\Scripture Apps\Apk Output

In the build process it builds in one place then move it to the folder above.

I sort my Apk Output folder so the newest APK is at the top.