Key transfer of old messages to someone in a 1 to 1 room

[michaelharmonart]

Is your suggestion related to a problem? Please describe.

At this point I've had at least one friend lose access to all their logged in matrix sessions, therefore losing messages they received before that point. Of course they can continue messaging me from a new session, but It would be great if there was a way to restore the messages they no longer have access to. I know it is possible since I can view all those messages, they keys are accessible somewhere by the client.

Describe the solution you'd like.

Allow an easy way to send keys to a new session that hasn't been cross signed by a previous one, such as when someone loses access to all their active matrix sessions.

[robintown]

I think a workaround for this might be to have your friend leave the room, and then invite them back in. Once they accept the invite, Element's key-sharing mechanism for historical messages should hopefully kick in.

[michaelharmonart]

I did have them try that, but I don't believe it worked. i'll need to go check with them to be certain though.

[aaronraimist]

Check that you see the message "Invited people will be able to read old messages" on the Invite dialog box, if you don't you are probably on an old version of Element. The current version is 1.7.33.

This issue is a duplicate of element-hq/element-meta#647 though so you can thumbs up that one.