Mp4 video not working in video element

I have uploaded an mp4 video I edited and am unsure how to insert it because the video element isn’t even showing the preview. I don’t know if this is a bug or my own incompetence. I’ve uploaded it to media first but I don’t know why it isn’t working because there are no errors other than the video itself not playing at all.

Below is what I see when I upload the mp4. If the video section isn’t how you’re supposed to upload videos on bricks then idk what to do.

Extra info on video file: it’s mp4, approximately 37KB, 720p, 20 seconds long

If I’m being dumb and missing something obvious please let me know I am so confused as this is the first time I’m working with videos in bricks

Does the video play inside the media library (WordPress backend → media).

Did you maybe use a codec like h.265 or something that’s not optimised for the web? maybe use ‘handbrake’ to encode it “for the web”. that always works for me