I am trying to find how to upload an image in private messages. I have looked everywhere but I can't find the button to be able to do that. All I can find is a box that asks for a URL but the pics are on my device. I don't think I'm going blind or stupid, but perhaps ...
You can always drag and drop the image to the conversation box, photos will have to be less than 1megabyte
There's a button of "upload a file", clicking that gives you the option to select from your device and send (although they may need to be resized).