Inject audio during a manual session Overview Audio injection allows audio files to be delivered to devices during manual testing sessions, enabling testing scenarios that involve recorded or real-time audio input. Prerequisites Before using audio injection in a manual session, ensure the following requirements are met: A private device that supports Bluetooth audio The device is running in Standard mode Lightning mode-enabled devices are currently not supported A valid audio file that meets the supported format and size requirements Audio injection is available only on devices with Bluetooth audio support. Supported audio format Audio files must meet the following requirements: Requirement Value Container WAV (PCM 16-bit), OGG, or MP3 Sample Rate 8 kHz Channels mono Max File Size 30 MB Files that do not meet these requirements cannot be injected, or only inject static noise. Using audio injection during a manual session From the Device List, select a device marked with the microphone icon and start a manual session. In the session toolbar, open Inject Media and select the Audio Injection tab. The panel displays an empty state prompting you to upload a file. The Inject button remains disabled until a file is uploaded. Upload an audio file by clicking the upload area or dragging and dropping the file into the panel. On the device, open the target application (for example, a voice recorder or phone app) and ensure it is ready to capture audio input. Select Inject. The panel displays an Injecting… status. On the device screen, the waveform and recording timer confirm that playback is in progress. When injection completes, a confirmation banner indicates that the audio file was injected successfully. Reviewing session artifacts To view session artifacts, after ending the session, open Session Overview. Under Audio tracks, you can download: Input audio – the uploaded audio file Injected audio – the audio delivered to the device Output audio – the audio captured from the device These artifacts help verify injection behavior and analyze results. Tips & best practices Filter supported devices Use the search filter Audio → Supported to display only devices with Bluetooth audio enabled. Verify audio format before upload Ensure the file meets the supported format and size requirements. Prepare the app before injecting audio Open the recording or target app and start recording before selecting Inject. Troubleshooting Inject button is disabled Confirm a file has been uploaded and meets format and size requirements. Inject option is not available Verify that Bluetooth audio is enabled for the device. Bluetooth audio is not available by default in all environments. Contact Kobiton Support to enable Bluetooth audio if it is not available on your private or local device. No audio is recorded Ensure the microphone is not muted. Confirm the target app is actively recording or listening. Check device volume and in-app input settings. On Android, some apps require Bluetooth to be selected as the audio input in system settings. Notes Bluetooth host limits One Mac mini host supports multiple Bluetooth hosts One Bluetooth host supports one device Audio output support Supported: HFP (calls, Google Meet, Zoom) Not supported: A2DP (YouTube, music, media playback)