Non-functioning post Gutenberg

I’ve tried this plugin a few times since WPv5.0 and never got it to work. The screenshots included with the plugin show pre-5.0 versions of wordpress and the ‘Add Media’ functionality has changed a lot since.

I wanted to use this to insert my Flickr images into posts and/or use them as Featured Images, but there is no option anywhere in the Gutenberg interface for this to work, plus there are no end of PHP errors showing up.

It’s so quiet on the support forum I can only assume that everyone has given up or no longer using it. A real shame