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In modern conferencing applications, users are not connected with each other, they are connected with a central server.

Transferring files shouldn't involve that central server, so you'd need to establish a direct connection between the users, and with network topologies those days, it will most likely require a relay between the two. It's not great.

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> Transferring files shouldn't involve that central server, so you'd need to establish a direct connection between the users

That's exactly what Galene does when a user requests a file transfer.

> with network topologies those days, it will most likely require a relay between the two

We perform NAT traversal by using the server to punch holes in both NATs. Only if that fails (due to a symmetric NAT or to an overly restrictive firewall) do we fall back to relaying through the server.

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