http://qvt3o2ipzxx3gtoyafd3ptqwsxjs52enlwlxuryn2xjkm7hnp5icd6yd.onion/coyim/whats-new-v04/introduction/2022/02/14/whats-new-in-v04-file-transfer.html
But without warning to the user, the files
would be transferred completely in the clear. I myself, and many other security conscious individuals, had to come up
with a method where we first encrypted the file with an outside program, such as GPG, and then send this encrypted file,
and finally sent the key in the main conversation window, making sure it was encrypted.