View attachment 4884530
the trick on rff i found to this is post the jpeg using 'insert image' with single landscape-looking icon.
then after it shows up on reply page at larger intended size, click once w/mouse on center of image chosen,
creating a blue crop box around full image.
then drag right-side of blue corner tag to smaller size to close to ~50% of page width, click outside box, save.
It shows image at closer to correct intended viewing resolution while sometimes it seems it doesn't matter unless looking for sharpness.