A YouTube channel contains many videos and several kinds of artwork. Its profile image, banner, and individual video thumbnails are different assets.
Choose the desired video
Open the specific upload whose cover you want and copy its direct link. A channel handle or channel identifier does not tell ToolNivo which video to inspect. The thumbnail downloader is not a channel-banner or profile-image downloader.
Verify the image type
After retrieving a result, check that it is the video's cover rather than expecting the channel logo. If you need artwork you created for your own channel, look for the original asset in your design archive.
Keep records precise
Store the individual video URL with the saved thumbnail. You can add the channel URL as context, but do not use it as a substitute for the source. Precise links matter when a channel has similarly named uploads or changes its visible branding after you saved the image.