How To add this 1 click dowload file section in shopify?

[Emiway1]

How To add this 1 click dowload file section in shopify?

URL: https://dmmwales.com/collections/slings-lanyards/products/nylon-26mm?variant=43720758395139

if we click here it will get dowloaded in 1 click only 

i want this in collapsible row on my product page and with custom metafield

[Asad-Mahmood]

It's already downloading the document in one click 

[Emiway1]

i Want To Add This Feature In My storee

[Asad-Mahmood]

Ahh ok that was a reference website 
This can be done by modifying the theme code. I can help you in that