It’s always the small things you overlook…
The docker-compose.yml I copied from somewhere when setting up lemmy.world apparently was missing the external network for the pictrs container… So pictrs was working, as long as it got the images via Lemmy.
Getting the images via URL didn’t work…
Looks like it’s working now. Looks a whole lot better with all the images :-)
Edit For existing posts: Edit the post, then Save. (No need to change anything). This also fetches the image.
Out of curiosity does this work for direct links to imgur gifv format? Some of my posts I see (may have been to other instances) don’t load the preview.