Please forgive this question but I've been struggling with this. I can easily make a small clip, copy it and paste it in the middle of another clip, but the paste options disappear when I'm between two clips. Ctrl v does nothing unless I'm in the middle of another clip.
What I copy is staying in memory and when I'm in the middle of a clip the paste insert option is there, but as soon as I hit the little icon to take me to the end or beginning of a clip all the paste options disappear. When I move the CTI back to the middle of a clip, the paste options are there again and it works.