A custom 404 page can turn a dead end into a helpful interaction:

Effective text for reporting broken links should vary based on its placement—whether it is a simple button label, a polite request on a "404 Not Found" page, or a detailed form. "Report a Broken Link" "Mark as Broken" "Report Issue" "Send Feedback" "Fix a Broken Link" 404 Page Messaging

Options like "Download not working," "Incorrect destination," or "Missing image".