After I made a few changes to my project, Pubcoder suddenly produces a broken APK-file, which is only 2MB (should be around 30MB). There is no error message. Export to EPUB3 works fine. Any ideas?
If you are exporting for Google Play, you must upload both the APK file and expansion file.
Take a look here: https://docs.pubcoder.com/new/pubcoder_android_app.html#google-play-distribution