Sorry about my post here, it seems I can't find another place where to ask this question.
I am totally curious about something done over WhatsApp. I tried myself to do it with friends with audio messages back and forth and we can't find the answer.
When I send an audio message, I always record it first using the app Voice Memo. That is basically for my contacts not to see me online like 20 min! I send lots of audios messages daily. And long ones.
This specific person.. sometimes listen to my messages -so double blue tick- and sometimes no double blue tick -just grey- but the person listened to my message because then this person replies back always talking about it. How the hell the audio is "never seen" when I click info?
I tried with a friend on sending me an audio message... then me offline, then me listening to the message, then back online and gets back double blue tick for my friend. Or, being offline again, listening to it, then deleting the audio, coming back to online but comes back blue tick to my friend.
It's curious as this person has other of my audios with double blue tick, and other audios just double grey tick as never seen, but replied.
Bloody curios..