You can do it with
🤔 I’d love to uploaded sketches or loops of tracks nostr:npub1ne57gg8xphmfek292yyg9nlyfkgh273vtrguy8qz0fuh05frvrpqn2t7zd pls advise
Discussion
But really You don't "upload" to nostr.
You sign a Jason file that contains the location of the media.
You can use any hosting provider you want or can host yourself.
(I know blossom blah blah blah)