This may be apparent to some of you but I thought I’d post it anyway to save someone out there a bit of time in the future. I worked out how to pause the timeline while playing different media (video). This need arose when I needed the ability to attach and play narration on the base layer (and this is important so that the user can scroll through the audio at will using the timeline) while also having a video option on the slide too (the user can trigger the play of this video on will also). The problem was that I wasn’t able to pause the audio AND the timeline specifically when I chose to play the video. The timeline just kept on running even though the audio was paused and this messed up my ability to seek and caused the audio to cut out short.
So, solution. For video, now I just put it on another slide, put reference/trigger the video on the slide that I want the video on (like a big play button) and then I just use the lightbox function to play it, with the video controls on that slide. This pauses the timeline and everything appears to the user working well.