On this site specifically, if I try and copy/paste a link, 9 times out of 10, when I check it, it'll say "Oops! It appears this link is broken"....I'm not getting it.
Due to the cancellation of the penny, I no longer give 2¢ about anything. I may however, give a nickel
if you exit the page with the link, and then open it again, they will work. It has something to do with the way the site replaces the URL with a page name.... Until that happens, the link doesnt work on the page for you - but it will for anyone else that clicks on it.
When I'm mobile, I just put the url's within the brackets before and after manually.
Open one of your posts back up to edit, and you'll see what I mean.