How to add Insert button in attached file on New Thread?

Dear Everyone,
I've a question, please help me.

When I use IPS source forum, on New Thread, when attached file, not images, it have a button to insert that file to post, like this

But on Xenforo, only Images has the button, another files have not that button

My friend, how to make that button? please help me
thank you very much
(sorry for my English)

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