You could also host your own relay using the Citrine app.
Discussion
Host what?
A relay is where posted content is stored.
Nostr company runs it right ?
The basic premise is that like most social media you probably won't be able to upload 1 GB files.
This is true of Twitter, tik tok, Instagram, discord and even some file-sharing platforms.
To upload big files like movie length videos you probably will have to pay for that privilege like you do on discord, and twitter but if you're only doing 30 second long videos you will probably be OK unless it's 4K or something.
Nostr is simple, you NSEC/Key is your password, your Npub is your handle but you can use NIP-05 services like these to get easier handles.
https://orangepill.dev/nip-05/
If you have a website you can make a custom one.