Honestly I like that you sent your post via email XD - I’ll help you out despite the what I assume are 90% AI research you’ve done.
Anyway, you should be fine, you can make it .oga cause it’s audio only. I’ve never seen a .opus file in the wild, thats a weird file extension. If your only phone right now for the next 12 months is your Android 6 phone, I still want to say go for it. Opus support was added in Android 5. I think it’ll work out.
Because I see that you are capable of making notes with audio. Make 3 notes, each one .opus .ogg .oga See if any work.
First, I need to clarify something: previously I posted with more than one account because I wanted to see different reactions from Anki users. That was a mistake on my part, and I apologize — I didn’t intend to mislead anyone.
It’s like saying I ate some chocolate, but I didn’t mean to eat anything unhealthy.
I mean i believe you, I believe you didn’t mean to eat anything unhealthy - but you still ate the chocolate. You still are misleading people. I know you had no intentions, but you still misled people. The effort you put into making more accounts and act as people, I feel like you’ve done this before or will do it again. And I just wanna say, if you don’t intend to eat anything unhealthy, then don’t eat the chocolate.