Ah, you wanted the movie to play from the title or post text rather than comment? Yeah, I suspect that is not allowed. I for one find it highly distracting when scrolling downwards and things are moving around on their own, plus there's sound to consider, so I am kinda glad for that rule tbh - you might mean well here but anything that can be abused will be by someone with lower ethical standards:-(. I offer that as a potential reasoning as to why you might be struggling with making this happen.
But also, the Fediverse is not very technically advanced yet, compared to e.g. Reddit, but I think you are approaching it the right & only way: direct experimentation, leaning towards gifs, etc. Things might also vary by instance and if we are talking titles I believe by community, bc of how I've seen news articles set up differently. i.e. that text goes through a different filtering process, which presumably does not load images especially those with sound embedded. But I don't really post here only comment so that's all I got. One day such things will become easier but for now, the developers are working on other more pressing issues, like how to remain afloat against the constant DDoS attacks:-(. But I do wish you a happy resolution to this, to find something that you can live with:-).
