Self-XSS in DM (Mobile app)

There is a way to self-xss in the mobile app (made on Android)

Steps:

1. Open dm with anybody (myself in my case)
2. Send "<img src=x onerror=alert(1)>"
3. It alert : "1"

(Reopen the DM doesn't reexecute the script, it only work on the sender at the sending)

It maybe can be injected with other way