Thank you for creating this very useful plugin. But I'm having trouble with images. I see the Page Links To area on the bottom of an image when editing in the Image Library. When I select "An Alternate URL" the url field box then shows. But when I click to update the image post, I do get a confirmation that the Media attachment was updated. However, it does not save the redirected URL so it still links to its normal WordPress URL. I hope this can be fixed.