Catch the use case where the featured image needs to be used as the c…

…over

admin/apple-actions/index/class-export.php

@@ -138,6 +138,8 @@ public function fetch_exporter() {
 		} else {
 			$thumb_id       = get_post_thumbnail_id( $this->id );
 			$post_thumb_url = wp_get_attachment_url( $thumb_id );
+			// If Jetpack Boost is active, serve the cover image from the CDN.
+			$post_thumb_url = apply_filters( 'jetpack_photon_url', $post_thumb_url ); // phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals.NonPrefixedHooknameFound
 			if ( empty( $cover_caption ) ) {
 				$cover_caption = wp_get_attachment_caption( $thumb_id );
 			}