Drag and drop images onto the canvas to load them
The intended use case is to load past drawings and continue working on them in free draw. It's not meant to be a way to cheat and load any image in a public lobby.
Added additional clarification, thanks for the feedback!
Doesn't work, unfortunately.
EDIT: It actually does, but you have to have the image downloaded to your system first, and other players don't seem to see the image (tested on two browsers in the same lobby and some pubs).
In short, the script does what the description says, but it's only localized to you, as far as I'm aware of.