[ValleZ]

Awhile ago. XEP-0286 (mobile connection improvements) dated 2018-01-25. File sharing has many different XEPs and I have no idea which works, but I know that early XEPs usually didn't work because of NAT. XEP-0384 (encryption) dated 2022-01-18.

[SamWhited]

All of those are newer XEPs for things that existed long before those XEPs or those specific versions if the XEP were published. There may be specific issues (I do remember that p2p file sharing never worked unless you were a network engineer who could tame nat), but I'm skeptical that they were still an issue when other protocols came along. I could be wrong, of course.