Issue description

Cannot play an mp3, mp4, or any other music format using startAudioMixing on Android 10.

Reason

This is caused by an Android permission limit. If targetSdkVersion ≥ 29, you need to add relevant app privileges to play the a music file.

Solution

For Android projects with targetSdkVersion ≥ 29, add the following line in the application zone of the AndroidManifest.xml file to play the music file:

<application
   Android:requestLegacyExternalStorage="true">
   …
</application>

For more Android permission settings and considerations, see Add project permissions.