This can get a bit complicated with federation. This community is hosted on LW. I am accessing it via sopuli.xyz, and you via feddit.uk. All (presumably) have full bidirectional federation with each other.

When I hit send, this message will go to Sopuli’s outbox, which will then sync to LW for this community. At that point, this post will live on LW’s servers. Anyone accessing LW directly can see it, even if Sopuli were to go down. Later (probably less than a minute), LW will sync to Feddit.uk, at which point you will be able to see it.

Note that this is for text posts only. There have been some changes around images and video, both for bandwidth and liability reasons.