I am selling products at eBay. Each product listing has the same customer service info. Each time when I update customer service info, I have to go through each listing to update them. This is very time consuming work. So, I am thinking if I can create a standard page, then in my listing, I just include this page into the listing html. Each time I just only need to change this html file, no need to update every listing.
So, I create a html file stored in the server.
Then, in my listing, I tried the following in the listing html
But not working.