UPDATE OF UPDATE I hope this helps someone. It seems that the Buds+ have a hard time transitioning from mic to headsets and back. Once I disconnected the buds+ I was able to hear my recorded video. o connected them again via Bluetooth and I was able to hear my recorded video.
iam not an expert but now my guess is that the buds+ have a hard time transitioning across capabilities.
I tried with Kaltura (recording app for presentations). Same issue. I selected the buds+ as headsets and it goes on and record the voice. But if I try to listen to what I recorded right aftee I did it, I don't hear anything. I have to disconnect and connect them again...and then, I hear the recording.