Hello!
You can try removing some filters used by the plugin. This way:
$multipleDomain = MultipleDomain::instance();
remove_filter('content_url', [ $multipleDomain, 'fixUrl' ]);
remove_filter('wp_get_attachment_url', [ $multipleDomain, 'fixUrl' ]);
remove_filter('upload_dir', [ $multipleDomain, 'fixUploadDir' ]);
remove_filter('the_content', [ $multipleDomain, 'fixContentUrls' ], 20);
You may add/remove lines to the snippet above according to your needs. The hookFilters
function contains all the filters used by the plugin: https://github.com/straube/multiple-domain/blob/master/multiple-domain/MultipleDomain.php#L240
Regards