I sent a picture in the qq group with my mobile phone and deleted it immediately. Will others still be in the chat record if they don't see it?

I will. I've done it before, but as a result, you found out from someone else's mobile phone that all you actually deleted was the information of your own mobile phone chat conversation, and there was still some in someone else's mobile phone.

Later, I learned that in fact, after you sent a message, others had already received it through your mobile phone, just like you deleted the message in your mobile phone, but this is a sent message, and you can't delete it after others received it.