This issue only needs to be tested in Android. Install the app in a device with Android 9 or lower and no audio recording app installed. Login in a site and go to Private files. Click to add a new file and select "Audio". Check that a modal appears in the app and no error is displayed. If this step opens an external app it means that your device has an app installed to record audio, you should uninstall it or try with another device. In the modal, click the microphone button at the center of the view. Check that the timer at the bottom right starts (you'll have to accept microphone permissions depending on the Android version). Speak some words and then click stop. Check that you can play and hear what you recorded. Click "Done". Check that the audio file is successfully uploaded. Optional : repeat the test with an Android 10+ device and no audio recording app installed. Check that in step 3 you see an error saying that there's no app installed to perform the action.