Hi martin,
Both responsive_post_image_sizes and create_thumbnails are set to their defaults ([1, 1.5, 2] and true, respectively).
I uploaded this image with a resolution of 7680x4320, and I can see that the original is correctly stored in my s3 /orginal/1x folder AND there is an optimized version stored in /optimized/1x with a resolution of 1024x576. So that’s encouraging; previously I had said the images weren’t created in /optimized/1x and that appears to be incorrect.
However, when I view the post on either PC or mobile, in either Chrome or Firefox, I see that the image from /original/1x is embedded in the post. Here’s an inspection of that image:
(note: I have redacted my site’s domain from this screenshot, i also have DISCOURSE_RELATIVE_URL_ROOT set to /forum so that’s why you have /forum/ in that image src URL.)
So that’s what I’m seeing. Would you have any next steps I could attempt to debug further? Thanks so much for looking into this @martin. I really appreciate it.