Do you want to share encrypted files with specific recipients, but using npubs instead of GPG keys? Try Nostbox, a simple GUI app for encrypting/decrypting files. Supports saving to disk, as well as uploading/downloading through a temporary host (catbox.moe seems to work) so you can just share a URL.
Don't want to paste your nsec into my slop (smart), or have a need for extra privacy? Use the one-time pad to generate a new keypair for each file. Just remember to swap npubs with the recipient before sending.
Let me know if you want to take it for a test drive. 
GitHub
GitHub - davidjj999/nostbox: **Encrypt and decrypt files using Nostr keys — like GPG but for the Nostr ecosystem.** A simple cross-platform GUI app that lets you encrypt files for any Nostr npub and decrypt files sent to you. No PGP k ey servers, no certificate chains — just your nsec and the recipient's npub.
**Encrypt and decrypt files using Nostr keys — like GPG but for the Nostr ecosystem.** A simple cross-platform GUI app that lets you encrypt fil...