I notice while creating my community that due to the square nature of image/GIF previews in posts if the image/GIF is in landscape rather than portrait or square it gets cut off.
Would be great to have them scaled to fit the height of the area available as I'm sure the number of people clicking on an image or GIF from the preview to actually see the full size image is pretty small.
Would provide a better UX.
See my screenshot for example.