We'll create fresh WordPress site with Add Linked Images To Gallery installed. You have 20 minutes to test the plugin after that site we'll be deleted.
Create local copies of external images in the src attribute of img tags. This plugin extracts a list of IMG tags in the post, saves copies of those images locally as gallery attachments on the post.
Administrator has the option to replace the external src with the url of the local copy. Another option allows the plugin to be applied to all external images, or only to those on Flickr.
This plugin is particularly useful for photobloggers, especially those who update using the mail2blog Flickr API. The plugin will saved the linked image file from Flickr locally.