Thanks for the reply.
I create a fresh wordpress instance via AWS Lightsail.
I log into the wordpress admin, then select Appearence->Theme, then choose any other theme.
Either preview or apply, no images show up either way.
I also try manually to download a template from the web and upload the theme, it all seems to work except there are no images shown.
I created another fresh instance to test and this happens also out of the box from the AWS image.
I tried running the suggested IP fix on this page:
sudo mysql -u root -p -e "USE bitnami_wordpress; UPDATE wp_options SET option_value='http://SERVER-IP:PORT/wordpress/' WHERE option_name='siteurl' OR option_name='home';"
No luck so far.
OK I run the tool and get this code 56a34812-b2f1-8719-ecad-54bb8f9bd88b