So I have uploaded an image to test the new limits.
https://www.renderosity.com/mod/gallery/mables-rant-the-way-it-was-meant-to-be/2638054/
The image is sized to 4000 x 3035 but when I zoom the image it does not incease in size any more than the older image size
https://www.renderosity.com/mod/gallery/mable-rant-resize-test/2637511/

Am I being thick and missing something?