Remote domains cannot directly access your local UE5 Remote Control API. All tools on this page now send their localhost requests through the Chrome bridge extension.
Preferred: click Install from Chrome Web Store and choose Add to Chrome.
Fallback: if needed, download the ZIP, unzip it, open chrome://extensions, enable Developer mode, and click Load unpacked to select the extracted folder.
Return to this page, click Check Extension Connection, then use Take Screenshot.