Theme email overrides not working

Hello,

I’m trying to customise the emails that get sent to the customer after they make a donation. Overriding the emails in my theme files yourtheme/woocommerce/emails/customer-completed-order.php isn’t working, but if I edit the theme files in wc-donation-platform/includes/wc-templates/emails it is working.

Is this intended behaviour? I couldn’t find anything in the docs.

Is there another way of overriding the email templates in my theme?