It does not work for me either. I'm on Amethyst. 🤔
Discussion
That’s not good. There was no problem when I shared it on X. Maybe Nostr can’t handle native video yet?
I've uploaded a few animated shorts on here. I just have to compress it like crazy. I use Handbrake for that. If you have media encoder I'm sure that would work too. I feel like I've seen an account upload movies.
Example: I didn't upload it but it had to be compressed. Also shameless plug.
Awesome, and thanks for the tip. That film festival looks interesting too. Appreciate it.
I hope it works for you! Oh you can also choose a different host to upload to if one isn't working. I'm not sure what app you are using but on amethyst it looks like this: 
I'm not entirely sure what the difference between them are. I think you can even self host. But honestly that is all stuff that flies over my head. 😅 I just want to share images and videos.