Also, these are some file sharing apps.

Qrclip
NextCloud
OnionShare
Wormhole 

There's also "RetroShare" for the desktop, and the portable version. Haven't used it in a while. But it's very powerful. Is highly secure, and can do everything you want.

You need an invite from someone to use it. But that's easy with Nostr or SimpleX.

Just set up an account for yourself. Then posted on Nostr or on SimpleX. Done..😊