It's now an eBay policy violation to include links to manufacturer datasheets or product manuals.
However, embedded HTML 'images' are still allowed.
The following should work for most browsers except Microsoft Internet Explorer & Edge.
Go back to the original eBay listing & right-click on the link (long press on mobile). You want to look for an option like [Open image in new tab] or [View image]. On mobile, you may have to scroll the context menu to find the option. The actual link will bring you back here.