Unable to paste in vnc

I have enabled shift+insert keys to enable pasting in vnc. I am still not able to paste the selected texts. Following are the other settings.

/plugins/clipman/settings/add-primary-clipboard             true
/plugins/clipman/settings/history-ignore-primary-clipboard  false
/plugins/clipman/settings/show-qr-code                      true
/plugins/clipman/tweaks/paste-on-activate                   2