I am unable to see my other computers in Cloudless File Transfer

This is a Windows Firewall issue, not a code bug. Here's what's happening:

UDP discovery (broadcast, port 41234) works fine -- all machines see each other. But TCP file transfer (port 41235) requires the receiver's firewall to allow inbound connections.

• Local -> COMPUTER1: Works because COMPUTER1's firewall allows inbound TCP
• Local -> COMPUTER2: Fails because COMPUTER2's firewall blocks inbound TCP
• COMPUTER2 -> Local: Fails because your local machine's firewall also blocks inbound TCP

When the app first starts listening, Windows shows a firewall prompt. If it was dismissed or denied on COMPUTER2 and/or your local machine, inbound connections are silently dropped (= "Connect timed out" after 5 seconds).