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I don’t think I understand what you’re trying to do… So, essentially, you want to use WordPress’ regular featured image (which has to be manually set) if no external featured image is set, right?

That’s exactly what’ll happen if you specify a regular featured image and don’t set any external featured image with our plugin. Why do you want our plugin to use a WordPress URL to display the featured image?

Anyway, the function you need to look at is nelioefi_save_url. Just check that the $_POST['nelioefi_url'] is not set or empty and, if that’s the case, then recover the featured image URL just as you’re doing in your function.

Hi! Now I understand what you’re trying to do. If that’s the case, I’d recommend you change the function nelioefi_get_thumbnail_src in includes/nelio-efi-main.php, line 26, and use the following code (where we’ve added a couple of lines):

function nelioefi_get_thumbnail_src( $id ) {
  $image_url = get_post_meta( $id, '_nelioefi_url', true );
  if ( !$image_url || strlen( $image_url ) == 0 ) {
    if ( !has_post_thumbnail( $id ) )
      return 'http://example.com/link/to/external-placeholder.jpg';
    return false;
  }
  return $image_url;
}

In the previous code, the first two lines check if the post $id has a external featured image. If it doesn’t, then we check if a regular featured image is set. If it isn’t, then the post defines no featured image, which means we can return the placeholder.