I'm having trouble understanding the Attachment settings for "Image Resizing"
Do these settings only apply in Galleries? Not on attached images in forum posts?

User uploaded images into posts are coming through ImageMagick at the same pixel dimensions as they were submitted.
Example: "4,000px × 3,000px (scaled to 1,202px × 902px)"

If I could reduce pixel dimensions, I could set a higher % in Image Quality and still have an efficient file memory size.

What am I missing?