Depending on the context, OnionShare might be worth looking at:
https://onionshare.org/
The publisher of the data runs OnionShare on their laptop/workstation to share
the data. They send the generated unguessable .onion URL to the recipient who
can download the data by opening the URL in Tor Browser, or in their own
OnionShare app. There is no server in between to trust.
It's important to stress that OnionShare is only as secure as the mechanism for
sharing the onion URL, since anyone with the onion URL can access it. When the
publisher turns off OnionShare on their laptop/workstation it is no longer
available.
//Ed
