This support ticket is created Il y a 5 années et 7 mois. There's a good chance that you are reading advice that it now obsolete.
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The attribute "size" works only for custom image field, but you setup the custom field "work-photos" as a file field, so the attribute "size" does not work as you expected: hidden link
I suggest you change it as a custom image field, and upload those images, and test again.
I assume we are talking about the problem page: hidden link
section "Our Work", I can see it does output medium image size in HTML source code, for example:
I've changed how it is set up, if you check the template. When I was using output="raw" it ignores the image size. Removed it, and it gets the correct image size.