Why when i receive some recorded audios no play but no sound

[Android Central Question]

Like one record from a direct call and send the audio

 

[mustang7757]

Which phone, and is this a app?

I'll leave a Link to register so you can communicate here as a guest account you can only post questions but can't reply.
https://forums.androidcentral.com/showthread.php?t=409154

 

[B. Diddy]

Welcome to Android Central! So you're receiving these recordings from someone else? Is it as an email attachment, or a text message, or some other way? You're saying that the file looks like it's playing, but no audio can be heard?

 

[ManiacJoe]

What kind of file is it? (What is the file extension?)