The message app has been inconvenient still and Google isn't doing anything about fixing it. When I try to send a gif or an attachment in a message thread I already have open it directs me to create a new message and thinks I want to send the attachment to someone else. Then when I go back to the thread I had open, the attachment just sits there in the filed with a spinning wheel. I have to remove the attachment, leave the message thread and reopen it to get around it.