for a very busy work chat Zulip (npub1qfg…mum6) might better suited.
Delta Chat is offline first and does not have group admins.
Though if you only share links to your big files on a local server the message size should be fine, in the future there are also some ideas of integrating this in the app, so those messages look like normal messages.
You could also have a bot in each group that publishes a searchable archive in your company network.
