I can upload videos all night but it's complicated because Amethyst is not able yet to play videos before uploading them to nostr.build.
Btw the new UI if N.B is pretty nice 👌
Discussion
We just show the thumbnail provided by the OS. Is it not enough? We can add the full video in the new post page... It's just more work and a bit slower.
In my case it can be useful because I select the videos based on the thumbnail from my phone gallery but i'm not sure what's inside the videos. Could be nice to play it before the upload to verify it's the correct one wanted👌