Inject audio during a manual session (Beta) Learn how to inject an audio file directly into a connected device during a manual session to test recording apps, voice calls, and audio handling. Prerequisites A private device with bluetooth audio enabled running in Standard mode. Bluetooth audio requires an additional bluetooth-bridge server to enable. Contact Kobiton support for more details. A valid audio file that meets the required format and size. Supported audio format Requirement Value Container WAV (PCM 16-bit), OGG, or MP3 Sample Rate 8 kHz Bit Depth 16-bit Channels mono Max File Size 30 MB Inject audio In the Device List, choose a device marked with the microphone icon and launch a Manual Session. In the session, open Inject Media and select the Audio Injection tab. You’ll see an empty state inviting you to click or drag-and-drop a file. The Inject button is disabled until a file is uploaded. Select the upload area to open your system file browser (e.g., Downloads). Highlight your WAV file (e.g., sample.wav) and select Open. Open the target application on the device (e.g., a voice recorder app or phone app) so it’s ready to capture the injected audio. Choose Inject. The panel shows the status Injecting… above the purple action bar. On the device screen, the waveform and recording timer confirm playback is occurring. When the injection finishes, the session shows a confirmation banner: Audio file [file_name] has been injected successfully. Reviewing session artifacts After the session, open Session Overview. Under Audio tracks, you can download: Input audio: the uploaded audio tracks. Injected audio: the audio tracks that were injected to the device. Output audio: the output audio tracks. Tips & best practices Filter devices with bluetooth audio enabled Filter only devices with bluetooth audio enabled by selecting Audio → Supported in the search bar. Verify format before upload. Convert the audio file to 8 kHz, 16-bit, mono PCM WAV and keep the file size under 30 MB. Stage the device app first. Open the recording or target app and get it ready before clicking Inject. Troubleshooting Issue Resolution Inject button is disabled Ensure a file is uploaded and that it meets the required format (WAV, OGG, or MP3) and size (≤30 MB). No inject button Make sure the device has bluetooth audio enabled. Contact Kobiton support for more details on enabling bluetooth audio. No audio recorded in the app Unmute the microphone. Make sure the target app is actively recording or listening when you click Inject. Verify device volume and any in-app input settings.