nostr:npub1n47jznzclhr8kzyyv6dtl4cqeltuzuajngx93m3flw2sdw9kfmaqjh8w74 , nostr:npub1jz005en8k2rz0ug8wexw8s5gjhzxll73sydhg9wu4vplfrzykktsheh5z8 , you should be able to upload any size file direct to Damus if you have an account, auto-connects via nip 96.

The only think I can think of, is you need to authenticate your account using the DM code.

nostr:npub137c5pd8gmhhe0njtsgwjgunc5xjr2vmzvglkgqs5sjeh972gqqxqjak37w , can we confirm if they are authenticated?