how to attach image or text to recording at given time

I want to attach an object (Image or text) to the audio at a given time, smae concept like comments in soundcloud, while recording the audio I can add an object at the pinned time. How can this be done using AVAudioRecorder?

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AVAudioRecorder returns the currentTime during the recording process, you could use this time as a timestamp for your "pinned time"? Seems like a place to start.