Thank you.
What client do you use regularly?
I experimented on coracle, snort/iris, amethyst, primal, satellite, nosta & noStrudel.
Different UIs, I like the diversity, I love #nostr.
Maybe, hard to tell - I personally use https://nostr.build/ to upload images. There is a 10MB/file limit though on the free tier.
If your video is smaller then maybe just try there and see if that works. If it does, it's a void.cat problem 😀
Discussion
On Android I use Amethyst. On desktop in the browser mainly Primal at the moment