Middle-click copy/paste link to Spacemacs in Helm Org Insert Link

Question

I have just entered the Spacemacs ecosystem with no prior Emacs experience.

I want to copy paste a link with my mouse from my X clipboard using middle-click in Spacemacs Org mode. I have selected the link in my browser with double-clicking (or with C-c).

In Spacemacs, editing emacs-notes.org, I type C-c l and the following appears:

I can type the http://.../ with the yellow-filled-box cursor (), but I cannot use the mouse middle-click (or C-v) to paste it from my X clipboard and save me from all the typing.

~/.spacemacs contains:

(defun dotspacemacs/user-config ()
  (xterm-mouse-mode -1)) ;; copy paste with mouse middle button from X

Nevertheless, when I middle-click, the system pastes the link elsewhere (e.g. in the emacs-notes.org buffer). I have also tried disabling the mouse but this doesn't work either.

How can I paste a link from the X clipboard in the yellow-filled-boxed using the mouse (or a keyboard shortcut)?

If there are other ways to do this, I'd like to learn them.