uh, no? most people tend to go with whatever the op has written the main post in. if a character makes a video post, many people have their character reply in video format. if you want your character to reply in audio or text, you need to label that in your subject line, or somehow otherwise make it obvious that your character isn't giving a video reply.

we're all OBVIOUSLY writing in text. no fucking shit. but we're pretending our characters are using video, audio, and text functions. the fuck are you doing, bro?