I found out what the problem was. Check if you have Auto media preview set to On in Threads on Kbin settings (the cog in the top right of the Kbin website).
This enables your browser’s built in video player, making you able to view the video without having to download it.
I don’t think you linked to the video properly as it works as a download link to the mp4 file instead of displaying the video.
Hmm. Weird, works on mobile in Firefox. I’ll link an imgur upload
Cool the imgur link works That looks really dangerous I did not know that was a thing.
I found out what the problem was. Check if you have Auto media preview set to On in Threads on Kbin settings (the cog in the top right of the Kbin website).
This enables your browser’s built in video player, making you able to view the video without having to download it.