Tmux breaks interacting with the clipboard so much that it has its own dedicated Wiki page dealing with all of the different issues and settings: https://github.com/tmux/tmux/wiki/Clipboard
It literally doesn't though. The wiki page is for copying tmux copy-mode's internal selection. The selection and copying mechanisms of the terminal emulator still work just as well.
Tmux breaks interacting with the clipboard so much that it has its own dedicated Wiki page dealing with all of the different issues and settings: https://github.com/tmux/tmux/wiki/Clipboard