With each app update, the process of 'copy and paste' tends to change a little.
It's also slightly different between Google (Android) and Apple (iOS) products.
But the basics are as follows... In this example, we are going to explore how 'Horcrux' can be linked in replies...
https:// harrypotter . wikia . com/wiki/Horcrux
That's how a link should appear in the area where you type out your replies. And obviously, you need to remove the 'spaces' in between the 'periods'.
When you remove the spaces, and hit 'post', in the comments/replies, what everyone sees is only what's at the end of the URL web address. In this situation, it's 'Horcrux'