How to exclude GIF image from being cached by Jetpack CDN

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I’m using Jetpack Site Accelerator, but it looks like some big size GIF image (over 4MB) is broken.

I tried the code below to ‘exclude’ .gif file, however it doesn’t work. When I check with Chrome DevTools the img src still pointed to CDN url (i0.wp.com, i1.wp.com, …)

​

function exclude_gif_jp ( $val, $src, $tag ) {
$img_file = parse_url($src, PHP_URL_PATH);
if ( $img_file !== false && strrpos( $img_file, “.gif”) !== false ) {
return true;
}
return $val;
}
add_filter( ‘jetpack_photon_skip_image’, exclude_gif_jp 10, 3 );

Is there any other way?

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