The clipboard is an invisible Windows feature that allows pasting across different applications.

How are you copying the image? If you are using the "Show in Folder" option from the downloads list to open Windows File Explorer, then using right-click > Copy on the image file, then you could paste it somewhere else in Windows File Explorer, for example, into a different folder, or on your desktop. However, copying the file usually isn't the best way to share on the web (although maybe it would work for email attachments on some sites?).