Storyline 360 embedded web object timeline trigger

Good day everyone!
Traditionally I placed video files directly on the Storyline 360 slide, and could simply set it to auto play, and on completion, the next item would be triggered.

I am now embedding the video within an iframe (Insert, Video, Video from Website, embed code from shared MS Streams or Sharepoint video), to preserve space on the LMS server, and am experiencing 3 challenges:

1. the slide timeline will run, as it should, whether the user clicks on "play video" or not, meaning that the next item on the timeline will be triggered regardless. (it is logical that the program has no way of knowing that the embedded has completed playing video)
2. the embedded video does not autoplay (this could be a browser related issue with Chrome / Edge) - if this is possible, then I could use timeline for next trigger
3. the Animation option fade in / fade out are not available

Ultimately, I am trying to make the course as user friendly as possible - without too many "click next slide" clicks while on the same topic.

Has anyone come across a solution that will allow the embedded video to trigger the next item only when complete; as in the video played till the end as opposed to according to timeline?

At the moment it seems I will need to create seperate slides for each embed video with a manual "click next" in order to move to the next slide with next items.