Portainer SSL

I have installed Microk8s on my Ubuntu server, enabled Microk8s and set up my cluster. Everything is working fine and as expected. The issue is when I go to upload my own SSL certificates in the settings of Portainer and I select the Select File button under upload cert or key. The Select File buttons do not work. There is just simply no response when pressing those buttons. It’s as though the buttons are broken. Can anyone help with this please?