Featured Image “failed”

I couldn’t find the cause from the page source.

Is the target images registered in the media?

I’ve tried it all ways. I thought maybe it was the image size but they are all over 200 in size

Is the target image an image uploaded in the normal way of WordPress?

yes it is although I have also tried with images via ftp, same result. It says it’s done but displaying posts for not set images shows this is not so. Individual posts have the same issue on update. A manual set is ok. Also it is about 65 images only out of hundreds, the rest did a great job. ??

Is it the image you are displaying with the shortcode?
The plugin does not support shortcode images, but you can add the following code to the theme’s functions.php to support shortcode images.

add_filter( 'xo_featured_image_tools_post_content', function( $content ) {
	$content = do_shortcode( $content );
	return $content;
} );

no, nothing complicated at all. I make a new post, click update and most set the featured image but not all. I think it must be a clash with the theme somehow

Then I don’t know why they fail. ??