Images need to behave like consumer Skype
Pasting an image into the chat window, and having it very slowly upload like a file is very painful and not user friendly. Please emulate the behaviour of consumer Skype when it comes to handling images.
Teams even said my 4.4MB image was too large... other chat applications just compress the image and don't complain. You can't expect users to be compressing their own images in order to be able to send them, it'll be a support nightmare.