In Delta chat on android I currently don’t have previews of shared links. Can this be accomplished with Webxcd app? Or else, is there another Chatmail client that has it? Or would it need server-side support?
No, it is not possible with sandboxed webxdc apps as of now. It would be possible with a different, “client xdc” or “system xdc” extension that could plug into the interface. It is already possible with a bot, however.
Yes, you can add one of the bots mentioned in the thread or those found in the public bot store to your group and previews will then be enabled for everyone there.