Learner able to skip slide only once media completes

Hi.

I currently have a slide in my project in which the learner must watch a video in order for the slide to move on. It's currently set with a 'jump to next slide' when video completes trigger, which all works fine.

However, once a learner has watched the video and moved to the next slide, i'd like the option for the learner to return to that slide, and even skip to the slides before - and upon their return to the video slide they can skip without watching in full again.

I've been trying to do this with a true/false variable but no luck so far - any suggestions please?

Thanks