Add Insert Download button to front end text editor

Hi,
I am currently building my website where users can post from front-end form. I am trying to add the ‘insert download’ button on that front-end form so that I can get the files from the users and manage it in download monitor. How can I add that ‘insert button’ to front-end form and let those files store in ‘dlm_download’ post type.
Thanks!

https://www.ads-software.com/plugins/download-monitor/