For anyone that might need to hear it. I just installed the flatpak, and when linking it to my Molly app, I saw on the app the option to sync all message history. This is what always bugged me on the desktop client. Seems they finally went ahead to enable this feature.
Hmm … are you talking about the original Signal app or the Molly app? Because I don’t really understand your news here.
For me, as far as I am aware, Signal has always been synchronising the chat history. The only condition being, that you have connected your device before in the past, which I think is a good privacy feature. (Although, I haven’t checked, how far back it goes. Never needed that.) - You don’t want any random new device read all our history, or do you?