hi fedi-friends, I’m developing FediShare.
it’s a #P2P-style server based on #ActivityPub.
you install the desktop client;
you choose a folder to share;
it federates all the content;
and every file becomes a downloadable link across the #Fediverse.
https://github.com/insicd/fedishare

to see it in action, once you have installed the desktop client, you can choose a username, and FediShare creates an actor available on the Fediverse.
an example is currently online: search for "@alice@fedishare.console.itagora.it" on Mastodon or anywhere else.