attach to custom email

Hi. Thank you for this very convenient plugin.

It looks like the pdf invoice does not work with the woocommerce quick donation plugin. This plugin created an email type called ‘New Donation’. I wish to attach the invoice to this email type rather than the default woocommerce email types of New order/ processing email, etc.

Is it possible to attach the generated pdf files to this custom email type?
Any help will be appreciated.

https://wordpress.org/plugins/woocommerce-pdf-invoices/