You can import external links such as images or files via the SEARCH > SEARCH EXTERNAL LINKS option
This will show a list of external links currently found on the website. You cannot import the links found on this page immediately, but can use it with the URL to match option.
Clickable buttons will appear next to the external links that match the search e.g. IMPORT NEW PAGE or IMPORT FILE AND REWRITE URLS.
Click the relevant button to import the file.
Once have searched for the external url you can click the IMPORT FILES button to auto import all the files found with an IMPORT FILES button next to them.