Sync grabs images using an option for max length of 1500px, so the super long images are just a smattering of pixels that barely represent the original image.
I can’t find a way in the app to get a better quality version. I end up opening a web browser to view.
It should load the proper image when clicked outside of the comments.
I agree with you there. It’s a known issue, the workaround is to load into comments.