to add to that @Bert i would upload big files you want to share to big public (blossom.primal.net) or paid (satellite.earth, nostr.build, etc) servers. you can def serve them from your own relay (i like haven), but that will depend on your server's bandwidth limitations. I personally like to keep keep copies of certain files on my own server but usually share a mirrored version from another. really part of the reason i'm building Bloom (thanks @Logen lol), and i made it super simple to share files right to nostr from there (bloomapp.me shameless plug).