In a previous How To, I explained 3 ways to attach files and add screenshot to a ticket. I am quite enthusiastic to share that you can now link 2 tickets and add an hyperlink to a ticket.
Linking 2 tickets
Please see the video on how to link 2 tickets and navigate between them.
Adding an hyperlink to a ticket
See also how to add an hyperlink to a ticket. This hyperlink could be any URL.