Just did mine - it's actually Maximum dimensions; width: 200 pixels, height: 200 pixels, file size: 49.00 KiB.
Really easy to resize a picture in Windows too, just open the image in photos, right click on the image, click 'Resize Image', then you can type in the pixel width, it'll auto size the height, and then you can use the sliding scale to set the image quality (and file size) so it's within the above parameter.
This thread made me finally get mine sorted