External content such as YouTube or Google Docs is archived from the Digital Asset Inventory page, not by adding a manual entry directly.
Find the in-use external URL row in the inventory and click Archive URL in its Operations column. This opens the Manual Archive Entry form with the URL and title prefilled and the asset type locked to External Resource. Confirm the content date attestation, choose visibility, and save.
The system records the link and context but does not copy the external content. The Archive URL link appears only when the archive feature and manual archive entries are enabled and no active archive already covers the URL.