You'll need to purchase storage for uploads from a file hosting service like Nostr.build, but you can host your own media server. Consult nostr:nprofile1qqsqxapvypwtdjxcvqcujw7y4xearpyycvkgv43lcr3p3yg29hu65hgpz3mhxw309akx7cmpd35x7um58g6rsd3e9uq3yamnwvaz7tmwveex2mrp0yhxzurs9uqsuamnwvaz7tmwdaejumr0dshs0ymp24