[Help Wordpress] Loading images from an URL

I found a disussion about it here:
http://help.dimsemenov.com/discussions/royalslider-wordpress/1092-loading-an-image-from-external-url

But the final solution was not posted and the thread is closed.

I am just a user not a web programmer. Could I get help that I can understand?
Hopefully I am right that there is no documentation about that...

Thank you all very much!

Cheers
Ralph

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help.dimsemenov.com