I waited patiently for the thumbnail to be generated in Animation section, but no thumbnail was generated after 15 minutes.
Please delete this, I have no idea how to use this site, or something on ba is not working as it should. But will try again. Sorry…
I now know why the thumbnails are not working! It’s not enough to simply link to hosted images (they will not be detected as thumbnails). Instead you must ‘Upload’ the image directly into the post, then it will become available for selecting as a thumbnail!!
I am very very sorry for the clutter!! But now I know how to create thumbnails!!