To copy and paste an image into a conversation:
- Find the photo you want to send.
- Right click on the photo to copy the photo.
- Press Command⌘+V on a Mac OS X or CTRL+V on PC to paste the photo in the message box.
Once you upload the image, everyone in the conversation will be able to see a preview of that image. To get the full image they can click Download.
Note: Copy and pasting images is currently only a feature in Chrome.