There is a 10MB file upload limit via Damus. 

I dont believe there is a method currently to upload greater than 10MB via Damus, even with a paid nostr.build account.

Only via nostr.build web is this possible.

cc nostr:npub1nxy4qpqnld6kmpphjykvx2lqwvxmuxluddwjamm4nc29ds3elyzsm5avr7