sizcoz I tried here and do not receive the email! But I see in "developer tools" of Chrome than there are issues related to the application are hosted in a "http" server and not a "https".
I already did an webapp, with C2, than grab audio send it to firebase and send the link, received from firebase, in a email, with php mail function, but I do not know how to send an attached file in php mail.
NRABrazil
I will try to put up a tutorial over the weekend, If I have time