How to have table filter of the excel attachment file without any add-on in Confluence?

[Karmen Cheung]

This question is in reference to Atlassian Developer Documentation: JIRA email template changes

How to have table filter of the excel attachment file without having any add-on in Confluence?

[Nic Brough -Adaptavist-]

You don't.  Confluence ships with an add-on that allows you access to Excel attachments, but if the functionality in that is not good enough, you need code, in the form of add-ons, to do it.