According to your inquiry description, if the Capture works on Samsung Android device, the only reason why it would not work on Nexus (clean Android) is missing software to handle the audio recording.
In our local tests on Nexus 4 phone, clicking on the Audio button starts the built-in Audio recorder. However the same test on Nexus 7 tablet gives an error, because the tablet version does not have a preinstalled audio recorder. You should manually install audio recorder from the Play Store and make it default app.
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