I didn’t add it to the very bottom of the file – I had tried to add it to a different area.
So I went back in and added it to the very bottom of the file and it did allow me to save it without whiting out the screen. However, the featured image still doesn’t show up on the individual blog page. It’s just text showing.
Which is weird because the featured images show up on the overall blog page as the thumbnails, so I know each post has a featured image set. They’re just not showing up when you click to view the individual blog post.
Do I need to add additional code, or was the functions.php code you provided the only code that was needed to get the featured image to display on single blog posts?
Thanks again!