Besides your account size, there is no limit to the video/media use load size. I would still recommend using something like Handbrake to reduce video size if they are very large, just for ease of playback.

If you use Damus, Amethyst, Nostrudel, coracle, or Snort, it automatically connects to your nostr.build account, so all uploads will be added to your acct.

But it doesn’t tell you why to get one or what it costs until you click. It should appear in the center of the screen, in a large box below the error message.