Application is OK, but I can't install it (APK) on my (Android13) smartphone

[Anke]

@Anke

added a few lines in the Manifest

@sokol_osw see e.g. here:
https://community.appinventor.mit.edu/t/ai2-test-updated-for-sdk-31-android-12/62733/17?u=anke
(EDIT: only for Power Users)

Target API level 31

Not really a "simple" solution: Build the APK. Decompile it. Edit the Manifest and add android:exported="true" to each <activity ... > and <receiver ... >. Set targetSdkVersion = 31. Recompile it. Check if the app (APK) can be installed on your test devices. If so, convert the APK to AAB: Convert APK TO AAB File - Guides - Niotron Community (otherwise check if you missed to add android:exported="true" to every <activity> and <receiver> and continue with step 4).