I've set a comment and copyright info on Nikon D3500, but they aren't visible on the photo and neither is time stamp. Is there any extra setting to make them visible?
This kind of comment is added as "metadata" in the image file (typically EXIF). Any decent image viewer can display them (look for "metadata" or "EXIF" or"XMP" in the menus. But it is not printed over the visible image. There are ways to extract the comment from the image file and print it over the image.