Thread: like changing quality of the images uploaded to ClassiPress?

like changing quality of the images uploaded to ClassiPress?

I want to lower the quality of the images uploaded, I find as indicate a quality of 50%.

I tried agreagr Wordpress code in functions.php of the root of the theme
and the includes folder, but does not work

add_filter ('jpeg_quality', 'down_jpeg_quality');
down_jpeg_quality function () {
return 70;
}
please help