I would try re-exporting it as an MKV file and seeing if that makes a difference. I don't know what operating system you use but both Windows Movie Maker and iMovie should be able to quickly remux it.
I would try re-exporting it as an MKV file and seeing if that makes a difference. I don't know what operating system you use but both Windows Movie Maker and iMovie should be able to quickly remux it.
On second consideration if you're using nostr.build it should do all that compatability magic for you - so it's a mystery. I might be dead wrong on my gut assumption.