If you have tried steps 1-6 and the error "sadly we failed at downloading that specific media" still appears, the video site has likely deployed anti-downloading measures. Here is how to counter them.
Refresh the page, start playback, and immediately click DownloadHelper before the video loads fully. This can catch the initial manifest. Confirm network connectivity
This message appears to be an error or status notice from a browser extension or download tool (likely Video DownloadHelper or a similarly named downloader) indicating a failure to download a specific media item. Causes range from network problems and site protections to extension misconfiguration or changes in the media source. Check the media URL/source