How to attach a file without the user being able to explore all files?

This may give you some insight to what you want to do.

Implementing PHP File Upload Security

I can get the following to work & I would like to be able to copy the bottom link & then have it pasted into a text box within the category file, but I dont know how to do that. Do you know how?

PHP Code:

http://localhost/adverts/$user/drink/drinklinks
<button><a/href="/adverts/$user/drink/link/coke">Coke</a></button><br>
<button><a/href="/adverts/$user/drink/link/lime">Lime</a></button><br>
<button><a/href="/adverts/$user/drink/link/orange">Orange</a></button><br>

http://localhost/adverts/$user/drink/link/coke
<button><a/href="/adverts/$user/drink/link/coke">Coke</a></button>