Yes I know browser based one's like Firefox also existed, but were shut down due to some or other criminal abuse. The Magic Wormhole protocol does use a Rendezvous Server, so a 3rd party service does need to be operating.
Just open Warp, select the file to “send”, and copy the shareable code it generates. The recipient just opens Warp, clicks “receive”, punches in the code and… et voila: digital transference through the binary ether.
The files are encrypted for transfer, and it will use a local network if that is possible. It is compatible with the Magic Wormhole CLI.
Seeing it is open source, it would be really handy if someone extended this to other platforms too.
See
Warp: a Fantastically Simple File Transfer App for Linux - OMG! Ubuntu!#
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filetransfer 
When you need to send a file from your Linux desktop try Warp. It's a modern GTK4 app using the 'Wormhole' protocol for encrypted file sending between PCs.
