Gallery Shortcode not working

Hey all,

I try to use this in a template

<?php echo do_shortcode('[gallery ids="97,98,99"]'); ?>

it’s implemented in category.php and will be used outside the loop

But this don’t work at the moment.

For my understanding the ids are the image media ids, right? or does the shortcode only works in the loop with post attachments?

every feedback would be very much appreciated!

Cheers

P.S. in the final version the ids will be pulled from the category and will be delivered through a variable