I think that's because Terminal.app is providing paste, not Emacs. If you use Emacs commands to put text into the kill-ring, it has to make it from there into the pasteboard/clipboard and that's what xclip does for you.

On Thu, Dec 12, 2024 at 1:18 PM Filipp Gunbin <fgunbin@fastmail.fm> wrote:

On 12/12/2024 13:08 -0500, Ship Mints wrote:

> You need something like https://elpa.gnu.org/packages/xclip.html to assist
> connecting macOS terminal Emacs to the system pasteboard/clipboard.

Thanks, BTW paste with Command-V works, it's just copy that doesn't
work. Probably I'll disable xterm-mouse-mode anyway, but it would be
nice to have this resolved in Emacs.