Keet is great btw for video and chat, but I’ve fond its most useful use-case is just delivering documents p2p between my devices.
nostr:nevent1qqs87zsahwcdwe294wm2h52w9qh9w2jq827q0nzap6f6z4tcelhwjq...
Syncthing is e2e encrypted and goes through relay servers, but it's really good and handles lots of files gracefully