[E. Pluribus Unum]

You have to upload the image to a server like http://imgur.com and use the URL of the image.

[Paul46360]

Never had to do that before.

[Half Vast Conspiracy]

E. Pluribus Unum occasionally has the right answer, but to the wrong question.

You don’t have to upload the image if it is already on a server.

I see some genuinely helpful Freepers helped you out.