During live chat, support agents can draw on any shared images in the chat in order to better guide the user.
Click on any image in the chat to zoom in.
Click and drag on the image to draw lines as desired.
If you want to discard your lines and start over, click the "CLEAR" button.
When ready to share the modified image, click the "SEND" button.
The modified image is then shared to the chat.
You can do this on any image shared either by the support agent or the end user - including images that you've already drawn on.